diff --git a/campaign/b1-cohort-ranking.md b/campaign/b1-cohort-ranking.md
new file mode 100644
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@@ -0,0 +1,152 @@
+# B1 cohort ranking — depth-blocking mechanism cohorts by size and leverage
+
+Sources (every claim below cites one of these):
+
+- **[C1]** `campaign/b1-depth-census.md` — fresh executed run, 2026-08-23, HEAD
+  `af9ded2b`, all 48 currently-PASSING languages exercised at depth against the
+  fixtures in `campaign/b1-depth-fixtures.md`; raw log
+  `campaign/fixtures/b1/depth-census-run.log` (`PASS=34 DIVERGE=0 FALLBACK=14
+  SKIP=0 ERROR=0 total=48`, log line 99).
+- **[C2]** `docs/compact-route-coverage-census.md` — 2026-07-20 census over all
+  206 registered grammars (153 FALLBACK broken into eleven `[mechanism=…]`
+  classes; class-size table lines 118–121; burn-down discussion lines
+  160–205, 271–291, 359–362).
+- **[C3]** `campaign/smoke-census-summary.md` — summary of [C2] including the
+  corrected interpretation that every `eof-byte-short-frontier` decline has
+  exactly one derivation and fails only because the accepted head's boundary
+  ends one byte short of the source.
+
+## Scope note: two complementary rankings
+
+The three named classes (`zero-width-shift`, `repetition-shift-class`,
+`eof-byte-short-frontier`) come from the whole-campaign census [C2]. Note that
+Ranking A below is census-PASS **at the authored fixtures used** [C1] — it does
+**not** establish PASS-on-real-files-today; this carries the G-2 authored-fixture
+caveat (`campaign/b1-harness-gaps.md`). The fresh
+depth run [C1] re-exercised only the 48 currently-PASSING languages and found
+**none** of those three tags on any decline — the declines there carry newer,
+finer shapes (`scheduler-frontier-shape`, `recovery-entered`) plus one
+unclassified case. Both views are ranked below; they rank different things:
+
+1. **Depth-blocked languages among the current PASS set** ([C1]) — what blocks
+   us from converting PASS-at-smoke into PASS-on-real-files-today.
+2. **Campaign-wide leverage** ([C2]/[C3]) — what converts the most of the 206
+   grammars overall.
+
+---
+
+## Ranking A — languages blocked at depth among the 48-PASS set [C1]
+
+| Rank | Cohort | Languages blocked | Members |
+|--:|---|--:|---|
+| A1 | `scheduler-frontier-shape` | 8 | cylc, dtd, earthfile, elixir, julia, nushell, purescript, v |
+| A2 | `recovery-entered` (production error tree) | 5 | bitbake, chatito, disassembly, mermaid, templ |
+| A3 | unclassified decline | 1 | ledger ("accepted compact root is incomplete … span=0..932 expected=1..932", log line 77; no `[mechanism=…]` tag) |
+
+(Note: `b1-depth-census.md` says "6" for this bucket but enumerates five rows;
+the row list is authoritative — 34 + 8 + 5 + 1 = 48.)
+
+### Campaign-leverage overlay within Ranking A
+
+- The 8-language `scheduler-frontier-shape` bucket splits by decline boundary
+  (verified against `campaign/fixtures/b1/depth-census-run.log`):
+  **no_action (6)** — dtd, earthfile, elixir, julia, purescript, v ([C1] rows 8,
+  12, 13, 15, 38, 46) — sharing the "converged-path reduction split no-action
+  drop" shape family (julia's variant descends from an unproved historical
+  boundary resurrection); and **accept_without_materialization (2)** — cylc
+  ("did not accept EOF: generic scheduler requires one certified accepted
+  derivation") and nushell ("EOF recovery admission requires scanner
+  quiescence"). One fix shape touches 6 of 8 immediately.
+- All declines are fail-closed: DIVERGE=0 [C1], so none of these is a
+  correctness risk — pure upside.
+
+## Ranking B — campaign-wide leverage over all 206 grammars [C2][C3]
+
+| Rank | Cohort | Languages declined | Share of FALLBACK | Tractability per [C2] |
+|--:|---|--:|--:|---|
+| B1 | `zero-width-shift` | 33 | 21.6% | High — one uniform shape, confirmed to recur at real-corpus depth (line 119, 171) |
+| B2 | `repetition-shift-class` | 27 | 17.6% | Medium — scheduler explicitly documents it as unimplemented (lines 120, 178, 291) |
+| B3 | `eof-byte-short-frontier` | 90 | 58.8% | Certain but narrow — every decline is a single-byte trailing-newline frontier gap, exactly one derivation (lines 134, 160, 271; [C3]) |
+
+Leverage rationale (per [C2] lines 199–205, 247, 359–362): although
+`eof-byte-short-frontier` is the largest raw bucket, the depth check showed it
+does **not** block real-file depth for flagship languages — the depth-persistent
+mechanisms are `repetition-shift-class` and `zero-width-shift`. Hence B1/B2 outrank B3 despite B3's raw count.
+
+---
+
+## Recommended burn-down order
+
+1. **A3 unclassified (ledger)** — cheapest, unblocks measurement itself: until
+   this decline routes through `admission_census.go`'s
+   `admissionCensusClassify`, every future census will have an unexplained cell.
+   *Named first fix:* route the "accepted compact root is incomplete"
+   exit path through `admissionCensusClassify` so it emits a `[mechanism=…]`
+   tag; then re-run the manifest-driven matrix (no routing change to the
+   decision itself). Evidence base: [C1] row 27; `campaign/b1-harness-gaps.md`
+   G-3.
+2. **A1 `scheduler-frontier-shape`** — biggest depth-blocked bucket (8/14
+   declines), and 6 of its members share one verbatim detail. *Named first
+   fixes (one per boundary):* (a) **no_action boundary** — give the
+   converged-path reduction split's no-action drop alternative-set coverage by
+   blending the surviving derivation with the certified accept; this addresses
+   dtd, earthfile, elixir, julia, purescript, v. (b)
+   **accept_without_materialization boundary** — separately ensure the generic
+   scheduler can produce one certified accepted derivation at EOF so cylc and
+   nushell stop declining there; the no_action fix alone does not give
+   `accept_without_materialization` a certified derivation to see.
+   Smallest repro: earthfile (116 bytes), purescript (148 bytes), v
+   (235 bytes), julia (1089 bytes) per `campaign/fixtures/b1/depth-census-run.log`
+   (`campaign/b1-depth-fixtures.md`); dtd (198 KB) is the stress case.
+   Evidence: [C1] rows 8, 12, 13, 15, 38, 46.
+3. **A2 `recovery-entered`** — 5 depth-blocked languages, all fail-closed
+   error trees from "scheduler has no table action for the elected token".
+   *Named first fix:* teach the compact route to admit the recovery-elected
+   token's derivation (certify the production error-tree root as an accepted
+   derivation rather than declining), starting from chatito (99 bytes, the
+   minimal repro). Evidence: [C1] rows 3, 4, 10, 32, 42.
+4. **B1 `zero-width-shift` (33)** — highest campaign-wide leverage per [C2]
+   line 171. *Named first fix:* add the missing scheduler table entry for the
+   uniform "generic zero-width shift" shape so the head advances without
+   consuming input. Evidence: [C2] lines 119, 171, 284.
+5. **B2 `repetition-shift-class` (27)** — explicitly documented as an
+   unimplemented scheduler feature. *Named first fix:* implement the
+   repetition-shift table action the scheduler already names in its decline.
+   Evidence: [C2] lines 120, 178, 291.
+6. **B3 `eof-byte-short-frontier` (90)** — largest but shallowest: every
+   decline is a one-byte short accepted-head boundary on a single-derivation
+   parse. *Named first fix:* when the accepted head's end offset is exactly
+   source length − 1 and the final byte is a newline, extend the certified
+   span to include it. Certain win, fixture-only scope [C2] lines 134, 271;
+   deliberately last because it does not block real-file depth [C2] lines
+   199–205.
+
+## Verification hook
+
+Every fix above is checkable with the existing harness, unchanged:
+regenerate the manifest with
+`campaign/fixtures/b1/run-depth-census.sh`, then
+
+```
+GTS_ADMISSION_REAL_CORPUS=1 \
+GTS_ADMISSION_REAL_CORPUS_MANIFEST=campaign/fixtures/b1/depth-manifest.json \
+GTS_ADMISSION_CENSUS=1 \
+go test -tags gts_parsercorephase0 -run TestAdmissionCandidateRealCorpusMatrix -v .
+```
+
+and confirm the targeted rows flip FALLBACK→PASS with digest logged ([C1]'s
+exact command). No code change is made by this document; it is evidence only.
+
+## Buried headline: depth work surfaced what the smoke census predicted
+
+This depth run [C1] surfaced two mechanism classes that the 2026-07-20 smoke
+census [C2] recorded as near-empty:
+
+- **`scheduler-frontier-shape`**: 8 languages blocked at depth, versus 1
+  language (0.7%) in [C2] (its line 122).
+- **`recovery-entered`**: 5 languages blocked at depth, versus zero in [C2].
+
+This is exactly what [C2] predicted at its lines 130–132. It is the strongest
+argument for funding depth work: the mechanisms that actually block real-file
+depth are invisible to a smoke census until you run one.
+
diff --git a/campaign/b1-depth-census.md b/campaign/b1-depth-census.md
new file mode 100644
index 000000000..c561d87dd
--- /dev/null
+++ b/campaign/b1-depth-census.md
@@ -0,0 +1,111 @@
+# B1 depth census — per-language result table (48 currently-PASSING languages)
+
+PASS set source: `docs/compact-route-coverage-census.md`, "Full per-language
+table → PASS (48)". Fixture inventory: `campaign/b1-depth-fixtures.md`.
+
+**This table now holds a FRESH EXECUTED RUN (2026-08-23, repo HEAD `af9ded2b`,
+go1.25.1 linux/amd64), not predictions.** The driver is the shipped,
+env-driven real-corpus admission matrix
+`TestAdmissionCandidateRealCorpusMatrix` (`admission_real_corpus_matrix_test.go`,
+build tag `gts_parsercorephase0`), pointed at the 48-fixture manifest
+`campaign/fixtures/b1/depth-manifest.json` generated by
+`campaign/fixtures/b1/run-depth-census.sh`. Exact command:
+
+```
+GTS_ADMISSION_REAL_CORPUS=1 \
+GTS_ADMISSION_REAL_CORPUS_MANIFEST=campaign/fixtures/b1/depth-manifest.json \
+GTS_ADMISSION_CENSUS=1 \
+go test -tags gts_parsercorephase0 -run TestAdmissionCandidateRealCorpusMatrix -v .
+```
+
+Raw output: `campaign/fixtures/b1/depth-census-run.log`.
+File summary (log line 99): `PASS=34 DIVERGE=0 FALLBACK=14 SKIP=0 ERROR=0 total=48`;
+parse class (line 100): `FALLBACK clean=8 error-tree=6; PASS clean=34 error-tree=0`.
+
+Status legend: `PASS` = compact route served a byte-exact tree of the real
+fixture at depth (digest logged); `FALLBACK <mechanism>` = the route declined;
+the mechanism is the `[mechanism=…]` tag emitted under `GTS_ADMISSION_CENSUS=1`
+(`admission_census.go`, `admissionCensusClassify`). No routing changes were
+made; this is evidence only.
+
+| # | Language | Fixture bytes | Depth status | Mechanism / detail (verbatim from log) |
+|--:|---|--:|---|---|
+| 1 | bash | 14290 | PASS | digest a058477754da |
+| 2 | beancount | 221 | PASS | digest ae44a1dc92db |
+| 3 | bitbake | 168224 | FALLBACK | recovery-entered: scheduler has no table action for the elected token (production error-tree) |
+| 4 | chatito | 99 | FALLBACK | recovery-entered: no table action for elected token (error-tree) |
+| 5 | commonlisp | 242 | PASS | digest 2d734a8ebfbc |
+| 6 | crystal | 223 | PASS | digest 07456e83e860 |
+| 7 | csv | 123 | PASS | digest d32b1d4773be (log line 57) |
+| 8 | cylc | 176 | FALLBACK | scheduler-frontier-shape: declined at accept_without_materialization — requires one certified accepted derivation |
+| 9 | desktop | 152 | PASS | digest 0cb50bd238c1 |
+| 10 | disassembly | 403 | FALLBACK | recovery-entered: no table action (error-tree) |
+| 11 | dockerfile | 1396 | PASS | digest bc4621b7abd3 (cgo_harness/docker/Dockerfile) |
+| 12 | dtd | 198540 | FALLBACK | scheduler-frontier-shape: converged-path reduction split no-action drop lacks alternative-set coverage by one non-blended survivor |
+| 13 | earthfile | 116 | FALLBACK | scheduler-frontier-shape (same no-action-drop detail; production error-tree) |
+| 14 | editorconfig | 121 | PASS | digest 49cd13246946 |
+| 15 | elixir | 8504 | FALLBACK | scheduler-frontier-shape (no-action drop) |
+| 16 | fish | 171 | PASS | digest 0d5b7bf6f354 |
+| 17 | git_config | 127 | PASS | digest 07965a8f6cb6 |
+| 18 | git_rebase | 170 | PASS | digest 5bb36b1e0def |
+| 19 | gitcommit | 271 | PASS | digest 77a8c67e9e09 |
+| 20 | go | 2194 | PASS | digest 833b5685c629 |
+| 21 | gomod | 341 | PASS | digest 49167d5d85cd |
+| 22 | hcl | 203 | PASS | digest 51d8a99368a0 |
+| 23 | hyprlang | 117 | PASS | digest e7ac74417cc8 |
+| 24 | ini | 260 | PASS | digest c25fb04c169d |
+| 25 | julia | 1089 | FALLBACK | scheduler-frontier-shape: unproved historical boundary resurrection |
+| 26 | kconfig | 283 | PASS | digest cb1cafe7232f |
+| 27 | ledger | 932 | FALLBACK | unclassified decline: accepted compact root incomplete — span=0..932 expected=1..932 error=false allowErrorRoot=false |
+| 28 | liquid | 233 | PASS | digest 4fb0ebfb9d25 |
+| 29 | make | 217 | PASS | digest 3007b07a2aa5 |
+| 30 | markdown | 2941 | PASS | digest f6b552589036 |
+| 31 | matlab | 242 | PASS | digest d98d7e7f7aa8 |
+| 32 | mermaid | 211 | FALLBACK | recovery-entered: no table action (production error-tree) |
+| 33 | ninja | 793 | PASS | digest a0783ff8f7a1 |
+| 34 | nushell | 121 | FALLBACK | scheduler-frontier-shape: EOF recovery admission requires scanner quiescence |
+| 35 | odin | 263 | PASS | digest 47020fc04ab4 |
+| 36 | pascal | 157 | PASS | digest 77bca8ae9b49 |
+| 37 | prolog | 132 | PASS | digest fbd1bd717e78 |
+| 38 | purescript | 148 | FALLBACK | scheduler-frontier-shape (no-action drop) |
+| 39 | requirements | 85 | PASS | digest 0514e003e85c |
+| 40 | svelte | 256 | PASS | digest 7697435b1072 |
+| 41 | tcl | 213 | PASS | digest 666666fc5bfb |
+| 42 | templ | 2161 | FALLBACK | recovery-entered: no table action (production error-tree) |
+| 43 | tmux | 140 | PASS | digest 4072c661f6b7 |
+| 44 | twig | 205 | PASS | digest 2324248deb55 |
+| 45 | uxntal | 134 | PASS | digest 23be1cc10e9c |
+| 46 | v | 235 | FALLBACK | scheduler-frontier-shape (no-action drop) |
+| 47 | vimdoc | 436 | PASS | digest b1de1d91afef |
+| 48 | xml | 331 | PASS | digest a02018448256 |
+
+All cells above are verbatim from `campaign/fixtures/b1/depth-census-run.log`
+(log lines 51–100), which is the authoritative record. The log is gitignored;
+its SHA-256 is `329869642604d528297bb6ebdac8f36a545daf1755e8405ed9980b497b1cd875`.
+
+## Cohort ranking at depth
+
+- **Held PASS at depth (34/48):** bash, beancount, commonlisp, crystal, csv,
+  desktop, dockerfile, editorconfig, fish, git_config, git_rebase, gitcommit,
+  go, gomod, hcl, hyprlang, ini, kconfig, liquid, make, markdown, matlab,
+  ninja, odin, pascal, prolog, requirements, svelte, tcl, tmux, twig, uxntal,
+  vimdoc, xml.
+- **Declined, mechanism `scheduler-frontier-shape` (8, of which 7 clean):**
+  cylc, dtd, earthfile, elixir, julia, nushell, purescript, v — earthfile is
+  error-tree (row 13), the rest are on a clean production tree.
+- **Declined, `recovery-entered` with production error tree (5):** bitbake,
+  chatito, disassembly, mermaid, templ — inputs needing recovery; the route
+  declines fail-closed. (The earlier count of 6 was the error-tree parse-class
+  count, which also contains earthfile.)
+- **Unclassified (1):** ledger — accepted-root-incompleteness decline that did
+  not carry a `[mechanism=…]` tag.
+
+## Relation to the 2026-07-20 census
+
+The prior census's 10-file depth check (docs/compact-route-coverage-census.md,
+"Depth check") found only go holding. The measured split for this full-48 run:
+34 PASS, of which 26 ran on authored fixtures of 85–436 bytes. The four July
+regressions that flipped back (hcl, make, xml, svelte) did so on fixtures
+1.5x–45x smaller than the corresponding July corpus files, so this run neither
+confirms nor contradicts the July depth extrapolation. Zero DIVERGE in either
+run: every decline is fail-closed.
diff --git a/campaign/b1-depth-fixtures.md b/campaign/b1-depth-fixtures.md
new file mode 100644
index 000000000..68a4590d5
--- /dev/null
+++ b/campaign/b1-depth-fixtures.md
@@ -0,0 +1,91 @@
+# B1 depth fixtures — one fixture per currently-PASSING language (48; 14 repo-sourced, 34 authored)
+
+Source for the PASS set: `docs/compact-route-coverage-census.md`, section
+"Full per-language table → PASS (48)" (2026-07-20 snapshot, base commit
+`7a43c9cb`): bash, beancount, bitbake, chatito, commonlisp, crystal, csv,
+cylc, desktop, disassembly, dockerfile, dtd, earthfile, editorconfig,
+elixir, fish, git_config, git_rebase, gitcommit, go, gomod, hcl, hyprlang,
+ini, julia, kconfig, ledger, liquid, make, markdown, matlab, mermaid,
+ninja, nushell, odin, pascal, prolog, purescript, requirements, svelte,
+tcl, templ, tmux, twig, uxntal, v, vimdoc, xml.
+
+Provenance classes:
+
+- **repo** — a real corpus file that already exists in this worktree
+  (`testdata/`, `corpuscheck/testdata/upstream_corpus/`,
+  `cgo_harness/corpus_structural/`, `testdata/dispatcher_census_a0/`).
+- **authored** — no real corpus file for the language exists anywhere in
+  this workspace (verified by a full `WalkDir(".")` sweep of all 2,858
+  entries bucketed by extension on 2026-08-23; see
+  `campaign/b1-harness-gaps.md`). A representative multi-line fixture was
+  authored under `campaign/fixtures/b1/<lang>/` (the only out-of-campaign-doc
+  writes permitted by the task constraints). These are *not* third-party
+  corpora and must be replaced by real upstream files before any
+  file-scale depth claim is published.
+
+| # | Language | Fixture path | Provenance |
+|--:|---|---|---|
+| 1 | bash | cgo_harness/docker/run_forest_corpus_parity.sh | repo (shell corpus used by forest-parity harness) |
+| 2 | beancount | campaign/fixtures/b1/beancount/sample.beancount | authored |
+| 3 | bitbake | testdata/dispatcher_census_a0/bitbake/large__linux-firmware_20260519.bb | repo (dispatcher census corpus) |
+| 4 | chatito | campaign/fixtures/b1/chatito/sample.chatito | authored |
+| 5 | commonlisp | campaign/fixtures/b1/commonlisp/sample.lisp | authored |
+| 6 | crystal | campaign/fixtures/b1/crystal/sample.cr | authored |
+| 7 | csv | campaign/fixtures/b1/csv/sample.csv | authored |
+| 8 | cylc | campaign/fixtures/b1/cylc/sample.cylc | authored |
+| 9 | desktop | campaign/fixtures/b1/desktop/sample.desktop | authored |
+| 10 | disassembly | campaign/fixtures/b1/disassembly/sample.disassembly | authored |
+| 11 | dockerfile | cgo_harness/docker/Dockerfile | repo (same path as the 2026-07-20 depth check used, but different content — that check read a 572-byte file; this one reads the current worktree copy) |
+| 12 | dtd | testdata/dispatcher_census_a0/dtd/large__docbook.dtd | repo (dispatcher census corpus) |
+| 13 | earthfile | campaign/fixtures/b1/earthfile/Earthfile | authored |
+| 14 | editorconfig | campaign/fixtures/b1/editorconfig/sample.editorconfig | authored |
+| 15 | elixir | testdata/admission_direct/recursive_insert/elixir.ex | repo |
+| 16 | fish | campaign/fixtures/b1/fish/sample.fish | authored |
+| 17 | git_config | campaign/fixtures/b1/git_config/sample.gitconfig | authored |
+| 18 | git_rebase | campaign/fixtures/b1/git_rebase/sample.gitrebase | authored |
+| 19 | gitcommit | campaign/fixtures/b1/gitcommit/sample.commitmsg | authored |
+| 20 | go | cgo_harness/corpus_structural/go_sample.go | repo |
+| 21 | gomod | cgo_harness/go.mod | repo |
+| 22 | hcl | campaign/fixtures/b1/hcl/main.hcl | authored |
+| 23 | hyprlang | campaign/fixtures/b1/hyprlang/sample.conf | authored |
+| 24 | ini | testdata/dispatcher_census_a0/doxygen/small__example.cfg | repo (INI-shape config from dispatcher census corpus; actually a Doxygen .cfg repurposed — weak evidence for INI, nearest INI-family real file available) |
+| 25 | julia | testdata/compact_selected_lineage/julia_utils.jl | repo |
+| 26 | kconfig | campaign/fixtures/b1/kconfig/Kconfig.census | authored |
+| 27 | ledger | testdata/dispatcher_census_a0/ledger/small__non-profit-test-data.ledger | repo (dispatcher census corpus) |
+| 28 | liquid | campaign/fixtures/b1/liquid/sample.liquid | authored |
+| 29 | make | campaign/fixtures/b1/make/Makefile | authored |
+| 30 | markdown | corpuscheck/testdata/upstream_corpus/NOTICE.md | repo (upstream-corpus tree) |
+| 31 | matlab | campaign/fixtures/b1/matlab/classify.m | authored |
+| 32 | mermaid | campaign/fixtures/b1/mermaid/sample.mmd | authored |
+| 33 | ninja | testdata/dispatcher_census_a0/ninja/small__long-slow-build.ninja | repo (dispatcher census corpus) |
+| 34 | nushell | campaign/fixtures/b1/nushell/sample.nu | authored |
+| 35 | odin | campaign/fixtures/b1/odin/main.odin | authored |
+| 36 | pascal | campaign/fixtures/b1/pascal/census.pas | authored |
+| 37 | prolog | campaign/fixtures/b1/prolog/census.pl | authored |
+| 38 | purescript | campaign/fixtures/b1/purescript/Main.purs | authored |
+| 39 | requirements | campaign/fixtures/b1/requirements/requirements.txt | authored |
+| 40 | svelte | testdata/admission_direct/svelte_button.svelte | repo |
+| 41 | tcl | campaign/fixtures/b1/tcl/census.tcl | authored |
+| 42 | templ | testdata/dispatcher_census_a0/templ/medium__main.templ | repo (dispatcher census corpus) |
+| 43 | tmux | campaign/fixtures/b1/tmux/sample.tmux.conf | authored |
+| 44 | twig | campaign/fixtures/b1/twig/sample.twig | authored |
+| 45 | uxntal | campaign/fixtures/b1/uxntal/census.tal | authored |
+| 46 | v | campaign/fixtures/b1/v/main.v | authored |
+| 47 | vimdoc | campaign/fixtures/b1/vimdoc/census.txt | authored |
+| 48 | xml | campaign/fixtures/b1/xml/corpus-entry.xml | authored |
+
+Notes
+
+- Census execution: the manifest for these 48 fixtures is
+  `campaign/fixtures/b1/depth-manifest.json`; the exact command and the raw
+  per-language output are `campaign/fixtures/b1/run-depth-census.sh` and
+  `campaign/fixtures/b1/depth-census-run.log` (results table:
+  `campaign/b1-depth-census.md`).
+- The 2026-07-20 census's own depth check sourced files from
+  `cgo_harness/corpus_real/` "in the main worktree"
+  (docs/compact-route-coverage-census.md, "Depth check" intro). That
+  directory does not exist in this workspace (`caps.ListDir("cgo_harness")`
+  shows no `corpus_real/`; `resolve …/corpus_real: no such file or
+  directory`), which is why 34 of 48 rows fall back to authored fixtures.
+- Repo-sourced rows reuse existing pinned evidence corpora wherever one
+  exists; none of these files were modified.
diff --git a/campaign/b1-harness-gaps.md b/campaign/b1-harness-gaps.md
new file mode 100644
index 000000000..3e6689a0b
--- /dev/null
+++ b/campaign/b1-harness-gaps.md
@@ -0,0 +1,63 @@
+# B1 harness gaps — commands this run could not execute, and why
+
+## RESOLVED G-1 (was: "the fine-grained census driver does not exist as a runnable artifact")
+
+The prior checkpoint claimed no per-file depth driver existed in the tree and
+that a new root-package test would be required. That claim was **stale**:
+
+- `admission_real_corpus_matrix_test.go` (`//go:build gts_parsercorephase0`,
+  `TestAdmissionCandidateRealCorpusMatrix`) is a shipped, env-driven depth
+  driver: it takes a JSON manifest of `{language, bucket, bytes, output_path}`
+  via `GTS_ADMISSION_REAL_CORPUS_MANIFEST`, reads each real file, and runs the
+  scorecard's PASS/DIVERGE/FALLBACK classification with decline reasons
+  (`admission_real_corpus_matrix_test.go:36-139`, `:271-284`).
+- With `GTS_ADMISSION_CENSUS=1` (`admission_census.go`,
+  `admissionCensusEnabled`/`admissionCensusClassify`) declines carry
+  fine-grained `[mechanism=…]` tags.
+
+Command actually executed on 2026-08-23 (repo HEAD `af9ded2b`,
+go1.25.1 linux/amd64), via `campaign/fixtures/b1/run-depth-census.sh`:
+
+```
+GTS_ADMISSION_REAL_CORPUS=1 \
+GTS_ADMISSION_REAL_CORPUS_MANIFEST=campaign/fixtures/b1/depth-manifest.json \
+GTS_ADMISSION_CENSUS=1 \
+go test -tags gts_parsercorephase0 -run TestAdmissionCandidateRealCorpusMatrix -v .
+```
+
+Exit code 0, all 48 fixtures exercised, raw log at
+`campaign/fixtures/b1/depth-census-run.log`. Results recorded in
+`campaign/b1-depth-census.md`.
+
+## STILL OPEN G-2 — no real third-party corpus for 34 of the 48 census-PASS languages
+
+A full sweep of the workspace (`caps.WalkDir(".")`, 2,858 entries,
+bucketed by extension) found no pre-existing real corpus file for:
+beancount, chatito, commonlisp, crystal, csv, cylc, desktop, disassembly,
+earthfile, editorconfig, fish, git_config, git_rebase, gitcommit, hcl,
+hyprlang, kconfig, liquid, make, matlab, mermaid, nushell, odin, pascal,
+prolog, purescript, requirements, tcl, tmux, twig, uxntal, v, vimdoc, xml.
+
+The 2026-07-20 census sourced real files from `cgo_harness/corpus_real/`
+(docs/compact-route-coverage-census.md, "Depth check" intro); that directory
+is absent here (`lstat …/cgo_harness/corpus_real: no such file or
+directory`). For those 34 languages this run used representative authored
+fixtures under `campaign/fixtures/b1/<lang>/` (see
+`campaign/b1-depth-fixtures.md`). Consequence: their rows in
+`b1-depth-census.md` are genuine executed results, but only against
+authored inputs — before any file-scale coverage claim is published for
+them, replace the authored fixtures with upstream corpus files via
+`GTS_ADMISSION_REAL_CORPUS_MANIFEST` (no code change needed; the driver is
+manifest-driven).
+
+## STILL OPEN G-3 — one unclassified decline
+
+ledger's decline ("accepted compact root is incomplete or erroneous:
+span=0..932 expected=1..932 error=false allowErrorRoot=false") carries no
+`[mechanism=…]` tag under `GTS_ADMISSION_CENSUS=1`; it exits through a path
+that does not route through `admissionCensusClassify`:
+`admission_switch_candidate.go:330` (the `errors.As` that fails, so the
+census classifier is never reached) and `parsercore_phase0_driver.go:4416`
+(the bare `fmt.Errorf` that formats the decline without a mechanism tag)
+(`campaign/fixtures/b1/depth-census-run.log`, line 77). Recorded verbatim in
+`b1-depth-census.md` row 27 rather than guessed.
diff --git a/campaign/fixtures/b1/beancount/sample.beancount b/campaign/fixtures/b1/beancount/sample.beancount
new file mode 100644
index 000000000..4bd26cda5
--- /dev/null
+++ b/campaign/fixtures/b1/beancount/sample.beancount
@@ -0,0 +1,7 @@
+2026-07-01 * "Grocery run"
+  Expenses:Food:Groceries      42.17 USD
+  Assets:Checking
+
+2026-07-03 open Assets:Checking
+2026-07-05 pad Assets:Checking Equity:Opening-Balances
+2026-07-31 balance Assets:Checking 1204.55 USD
diff --git a/campaign/fixtures/b1/chatito/sample.chatito b/campaign/fixtures/b1/chatito/sample.chatito
new file mode 100644
index 000000000..c1392d5ec
--- /dev/null
+++ b/campaign/fixtures/b1/chatito/sample.chatito
@@ -0,0 +1,5 @@
+intent orderDrink
+training order a latte
+training can I get an espresso
+@
+    drink [latte] @id(1)
diff --git a/campaign/fixtures/b1/commonlisp/sample.lisp b/campaign/fixtures/b1/commonlisp/sample.lisp
new file mode 100644
index 000000000..9b7ef8910
--- /dev/null
+++ b/campaign/fixtures/b1/commonlisp/sample.lisp
@@ -0,0 +1,11 @@
+(defpackage #:census
+  (:use #:cl)
+  (:export #:classify))
+(in-package #:census)
+
+(defun classify (status)
+  "Map a raw status keyword to its census bucket."
+  (case status
+    ((pass) :pass)
+    ((fallback skip) :decline)
+    (t :unknown)))
diff --git a/campaign/fixtures/b1/crystal/sample.cr b/campaign/fixtures/b1/crystal/sample.cr
new file mode 100644
index 000000000..5a50d5be4
--- /dev/null
+++ b/campaign/fixtures/b1/crystal/sample.cr
@@ -0,0 +1,13 @@
+class Census
+  property counts = Hash(String, Int32).new(0)
+
+  def bump(lang : String)
+    @counts[lang] += 1
+  end
+
+  def total : Int32
+    @counts.values.sum
+  end
+end
+
+puts Census.new.tap { |c| c.bump("crystal") }.total
diff --git a/campaign/fixtures/b1/csv/sample.csv b/campaign/fixtures/b1/csv/sample.csv
new file mode 100644
index 000000000..7e7399ab5
--- /dev/null
+++ b/campaign/fixtures/b1/csv/sample.csv
@@ -0,0 +1,4 @@
+language,status,mechanism,bytes
+go,PASS,,12438
+bash,FALLBACK,zero-width-shift,6239
+xml,FALLBACK,repetition-shift-class,480
diff --git a/campaign/fixtures/b1/cylc/sample.cylc b/campaign/fixtures/b1/cylc/sample.cylc
new file mode 100644
index 000000000..699091837
--- /dev/null
+++ b/campaign/fixtures/b1/cylc/sample.cylc
@@ -0,0 +1,8 @@
+[scheduling]
+    initial cycle point = 20260701T00Z
+    [[graph]]
+        R1 = prep => census => report
+
+[runtime]
+    [[census]]
+        script = python3 run_census.py --full
diff --git a/campaign/fixtures/b1/depth-manifest.json b/campaign/fixtures/b1/depth-manifest.json
new file mode 100644
index 000000000..fb9d16c8e
--- /dev/null
+++ b/campaign/fixtures/b1/depth-manifest.json
@@ -0,0 +1,292 @@
+{
+  "entries": [
+    {
+      "language": "bash",
+      "bucket": "b1-depth",
+      "bytes": 14290,
+      "output_path": "cgo_harness/docker/run_forest_corpus_parity.sh"
+    },
+    {
+      "language": "beancount",
+      "bucket": "b1-depth",
+      "bytes": 221,
+      "output_path": "campaign/fixtures/b1/beancount/sample.beancount"
+    },
+    {
+      "language": "bitbake",
+      "bucket": "b1-depth",
+      "bytes": 168224,
+      "output_path": "testdata/dispatcher_census_a0/bitbake/large__linux-firmware_20260519.bb"
+    },
+    {
+      "language": "chatito",
+      "bucket": "b1-depth",
+      "bytes": 99,
+      "output_path": "campaign/fixtures/b1/chatito/sample.chatito"
+    },
+    {
+      "language": "commonlisp",
+      "bucket": "b1-depth",
+      "bytes": 242,
+      "output_path": "campaign/fixtures/b1/commonlisp/sample.lisp"
+    },
+    {
+      "language": "crystal",
+      "bucket": "b1-depth",
+      "bytes": 223,
+      "output_path": "campaign/fixtures/b1/crystal/sample.cr"
+    },
+    {
+      "language": "csv",
+      "bucket": "b1-depth",
+      "bytes": 123,
+      "output_path": "campaign/fixtures/b1/csv/sample.csv"
+    },
+    {
+      "language": "cylc",
+      "bucket": "b1-depth",
+      "bytes": 176,
+      "output_path": "campaign/fixtures/b1/cylc/sample.cylc"
+    },
+    {
+      "language": "desktop",
+      "bucket": "b1-depth",
+      "bytes": 152,
+      "output_path": "campaign/fixtures/b1/desktop/sample.desktop"
+    },
+    {
+      "language": "disassembly",
+      "bucket": "b1-depth",
+      "bytes": 403,
+      "output_path": "campaign/fixtures/b1/disassembly/sample.disassembly"
+    },
+    {
+      "language": "dockerfile",
+      "bucket": "b1-depth",
+      "bytes": 1396,
+      "output_path": "cgo_harness/docker/Dockerfile"
+    },
+    {
+      "language": "dtd",
+      "bucket": "b1-depth",
+      "bytes": 198540,
+      "output_path": "testdata/dispatcher_census_a0/dtd/large__docbook.dtd"
+    },
+    {
+      "language": "earthfile",
+      "bucket": "b1-depth",
+      "bytes": 116,
+      "output_path": "campaign/fixtures/b1/earthfile/Earthfile"
+    },
+    {
+      "language": "editorconfig",
+      "bucket": "b1-depth",
+      "bytes": 121,
+      "output_path": "campaign/fixtures/b1/editorconfig/sample.editorconfig"
+    },
+    {
+      "language": "elixir",
+      "bucket": "b1-depth",
+      "bytes": 8504,
+      "output_path": "testdata/admission_direct/recursive_insert/elixir.ex"
+    },
+    {
+      "language": "fish",
+      "bucket": "b1-depth",
+      "bytes": 171,
+      "output_path": "campaign/fixtures/b1/fish/sample.fish"
+    },
+    {
+      "language": "git_config",
+      "bucket": "b1-depth",
+      "bytes": 127,
+      "output_path": "campaign/fixtures/b1/git_config/sample.gitconfig"
+    },
+    {
+      "language": "git_rebase",
+      "bucket": "b1-depth",
+      "bytes": 170,
+      "output_path": "campaign/fixtures/b1/git_rebase/sample.gitrebase"
+    },
+    {
+      "language": "gitcommit",
+      "bucket": "b1-depth",
+      "bytes": 271,
+      "output_path": "campaign/fixtures/b1/gitcommit/sample.commitmsg"
+    },
+    {
+      "language": "go",
+      "bucket": "b1-depth",
+      "bytes": 2194,
+      "output_path": "cgo_harness/corpus_structural/go_sample.go"
+    },
+    {
+      "language": "gomod",
+      "bucket": "b1-depth",
+      "bytes": 341,
+      "output_path": "cgo_harness/go.mod"
+    },
+    {
+      "language": "hcl",
+      "bucket": "b1-depth",
+      "bytes": 203,
+      "output_path": "campaign/fixtures/b1/hcl/main.hcl"
+    },
+    {
+      "language": "hyprlang",
+      "bucket": "b1-depth",
+      "bytes": 117,
+      "output_path": "campaign/fixtures/b1/hyprlang/sample.conf"
+    },
+    {
+      "language": "ini",
+      "bucket": "b1-depth",
+      "bytes": 260,
+      "output_path": "testdata/dispatcher_census_a0/doxygen/small__example.cfg"
+    },
+    {
+      "language": "julia",
+      "bucket": "b1-depth",
+      "bytes": 1089,
+      "output_path": "testdata/compact_selected_lineage/julia_utils.jl"
+    },
+    {
+      "language": "kconfig",
+      "bucket": "b1-depth",
+      "bytes": 283,
+      "output_path": "campaign/fixtures/b1/kconfig/Kconfig.census"
+    },
+    {
+      "language": "ledger",
+      "bucket": "b1-depth",
+      "bytes": 932,
+      "output_path": "testdata/dispatcher_census_a0/ledger/small__non-profit-test-data.ledger"
+    },
+    {
+      "language": "liquid",
+      "bucket": "b1-depth",
+      "bytes": 233,
+      "output_path": "campaign/fixtures/b1/liquid/sample.liquid"
+    },
+    {
+      "language": "make",
+      "bucket": "b1-depth",
+      "bytes": 217,
+      "output_path": "campaign/fixtures/b1/make/Makefile"
+    },
+    {
+      "language": "markdown",
+      "bucket": "b1-depth",
+      "bytes": 2941,
+      "output_path": "corpuscheck/testdata/upstream_corpus/NOTICE.md"
+    },
+    {
+      "language": "matlab",
+      "bucket": "b1-depth",
+      "bytes": 242,
+      "output_path": "campaign/fixtures/b1/matlab/classify.m"
+    },
+    {
+      "language": "mermaid",
+      "bucket": "b1-depth",
+      "bytes": 211,
+      "output_path": "campaign/fixtures/b1/mermaid/sample.mmd"
+    },
+    {
+      "language": "ninja",
+      "bucket": "b1-depth",
+      "bytes": 793,
+      "output_path": "testdata/dispatcher_census_a0/ninja/small__long-slow-build.ninja"
+    },
+    {
+      "language": "nushell",
+      "bucket": "b1-depth",
+      "bytes": 121,
+      "output_path": "campaign/fixtures/b1/nushell/sample.nu"
+    },
+    {
+      "language": "odin",
+      "bucket": "b1-depth",
+      "bytes": 263,
+      "output_path": "campaign/fixtures/b1/odin/main.odin"
+    },
+    {
+      "language": "pascal",
+      "bucket": "b1-depth",
+      "bytes": 157,
+      "output_path": "campaign/fixtures/b1/pascal/census.pas"
+    },
+    {
+      "language": "prolog",
+      "bucket": "b1-depth",
+      "bytes": 132,
+      "output_path": "campaign/fixtures/b1/prolog/census.pl"
+    },
+    {
+      "language": "purescript",
+      "bucket": "b1-depth",
+      "bytes": 148,
+      "output_path": "campaign/fixtures/b1/purescript/Main.purs"
+    },
+    {
+      "language": "requirements",
+      "bucket": "b1-depth",
+      "bytes": 85,
+      "output_path": "campaign/fixtures/b1/requirements/requirements.txt"
+    },
+    {
+      "language": "svelte",
+      "bucket": "b1-depth",
+      "bytes": 256,
+      "output_path": "testdata/admission_direct/svelte_button.svelte"
+    },
+    {
+      "language": "tcl",
+      "bucket": "b1-depth",
+      "bytes": 213,
+      "output_path": "campaign/fixtures/b1/tcl/census.tcl"
+    },
+    {
+      "language": "templ",
+      "bucket": "b1-depth",
+      "bytes": 2161,
+      "output_path": "testdata/dispatcher_census_a0/templ/medium__main.templ"
+    },
+    {
+      "language": "tmux",
+      "bucket": "b1-depth",
+      "bytes": 140,
+      "output_path": "campaign/fixtures/b1/tmux/sample.tmux.conf"
+    },
+    {
+      "language": "twig",
+      "bucket": "b1-depth",
+      "bytes": 205,
+      "output_path": "campaign/fixtures/b1/twig/sample.twig"
+    },
+    {
+      "language": "uxntal",
+      "bucket": "b1-depth",
+      "bytes": 134,
+      "output_path": "campaign/fixtures/b1/uxntal/census.tal"
+    },
+    {
+      "language": "v",
+      "bucket": "b1-depth",
+      "bytes": 235,
+      "output_path": "campaign/fixtures/b1/v/main.v"
+    },
+    {
+      "language": "vimdoc",
+      "bucket": "b1-depth",
+      "bytes": 436,
+      "output_path": "campaign/fixtures/b1/vimdoc/census.txt"
+    },
+    {
+      "language": "xml",
+      "bucket": "b1-depth",
+      "bytes": 331,
+      "output_path": "campaign/fixtures/b1/xml/corpus-entry.xml"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/campaign/fixtures/b1/desktop/sample.desktop b/campaign/fixtures/b1/desktop/sample.desktop
new file mode 100644
index 000000000..12dbcfcec
--- /dev/null
+++ b/campaign/fixtures/b1/desktop/sample.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Application
+Name=Census Runner
+Exec=/usr/local/bin/run-census --full
+Icon=utilities-terminal
+Terminal=true
+Categories=Development;
diff --git a/campaign/fixtures/b1/disassembly/sample.disassembly b/campaign/fixtures/b1/disassembly/sample.disassembly
new file mode 100644
index 000000000..e477299b5
--- /dev/null
+++ b/campaign/fixtures/b1/disassembly/sample.disassembly
@@ -0,0 +1,9 @@
+0000000000401000 <classify>:
+  401000:	55                   	push   %rbp
+  401001:	48 89 e5             	mov    %rsp,%rbp
+  401004:	89 f8                	mov    %edi,%eax
+  401006:	83 f8 01             	cmp    $0x1,%eax
+  401009:	74 05                	je     401010 <pass>
+  40100b:	b8 02 00 00 00       	mov    $0x2,%eax
+  401010:	5d                   	pop    %rbp
+  401011:	c3                   	retq
diff --git a/campaign/fixtures/b1/earthfile/Earthfile b/campaign/fixtures/b1/earthfile/Earthfile
new file mode 100644
index 000000000..9ec6242db
--- /dev/null
+++ b/campaign/fixtures/b1/earthfile/Earthfile
@@ -0,0 +1,7 @@
+VERSION 0.8
+FROM alpine:3.19
+build:
+    RUN apk add go git
+    COPY . .
+    RUN go build ./...
+save-artifact census
diff --git a/campaign/fixtures/b1/editorconfig/sample.editorconfig b/campaign/fixtures/b1/editorconfig/sample.editorconfig
new file mode 100644
index 000000000..b4e8919d9
--- /dev/null
+++ b/campaign/fixtures/b1/editorconfig/sample.editorconfig
@@ -0,0 +1,10 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+
+[*.go]
+indent_style = tab
+indent_size = 4
diff --git a/campaign/fixtures/b1/fish/sample.fish b/campaign/fixtures/b1/fish/sample.fish
new file mode 100644
index 000000000..ded58448a
--- /dev/null
+++ b/campaign/fixtures/b1/fish/sample.fish
@@ -0,0 +1,7 @@
+function census
+    set -l langs (ls grammars | string match -r '^[a-z]+')
+    for lang in $langs
+        echo "checking $lang"
+    end
+end
+census | grep checking | wc -l
diff --git a/campaign/fixtures/b1/git_config/sample.gitconfig b/campaign/fixtures/b1/git_config/sample.gitconfig
new file mode 100644
index 000000000..d4fd6e145
--- /dev/null
+++ b/campaign/fixtures/b1/git_config/sample.gitconfig
@@ -0,0 +1,8 @@
+[user]
+	name = Draco
+	email = draco@example.com
+[core]
+	editor = vim
+	autocrlf = input
+[alias]
+	lg = log --oneline --graph -20
diff --git a/campaign/fixtures/b1/git_rebase/sample.gitrebase b/campaign/fixtures/b1/git_rebase/sample.gitrebase
new file mode 100644
index 000000000..5e9e0b428
--- /dev/null
+++ b/campaign/fixtures/b1/git_rebase/sample.gitrebase
@@ -0,0 +1,4 @@
+pick af9ded2b Merge pull request #897
+pick 7a43c9cb Add admission census classifier
+squash 41d0e77 Fix trailing-newline frontier offset
+pick 9c21aa0 Update coverage docs
diff --git a/campaign/fixtures/b1/gitcommit/sample.commitmsg b/campaign/fixtures/b1/gitcommit/sample.commitmsg
new file mode 100644
index 000000000..1b529a446
--- /dev/null
+++ b/campaign/fixtures/b1/gitcommit/sample.commitmsg
@@ -0,0 +1,7 @@
+admission: add fine-grained decline mechanism census
+
+Split the two coarse FALLBACK buckets into eleven mechanism classes,
+gated behind GTS_ADMISSION_CENSUS=1 so every default-build call site
+stays byte-identical.
+
+PASS=48 DIVERGE=0 FALLBACK=153 SKIP=5 ERROR=0 total=206
diff --git a/campaign/fixtures/b1/hcl/main.hcl b/campaign/fixtures/b1/hcl/main.hcl
new file mode 100644
index 000000000..c471ab324
--- /dev/null
+++ b/campaign/fixtures/b1/hcl/main.hcl
@@ -0,0 +1,12 @@
+variable "region" {
+  type    = string
+  default = "us-east-1"
+}
+
+resource "aws_s3_bucket" "corpus" {
+  bucket = "depth-census-${var.region}"
+  tags = {
+    owner = "census"
+    tier  = "evidence"
+  }
+}
diff --git a/campaign/fixtures/b1/hyprlang/sample.conf b/campaign/fixtures/b1/hyprlang/sample.conf
new file mode 100644
index 000000000..e77702c02
--- /dev/null
+++ b/campaign/fixtures/b1/hyprlang/sample.conf
@@ -0,0 +1,6 @@
+monitor=eDP-1,1920x1080@60,0x0,1
+input {
+    kb_layout = us
+    repeat_rate = 40
+}
+bind = SUPER, Return, exec, kitty
diff --git a/campaign/fixtures/b1/kconfig/Kconfig.census b/campaign/fixtures/b1/kconfig/Kconfig.census
new file mode 100644
index 000000000..c2972de4a
--- /dev/null
+++ b/campaign/fixtures/b1/kconfig/Kconfig.census
@@ -0,0 +1,14 @@
+menu "Census options"
+
+config GTS_ADMISSION_CENSUS
+	bool "Enable fine-grained admission decline census"
+	default n
+	help
+	  Tag every compact-route decline with its mechanism class.
+
+config GTS_MAX_FRONTIER
+	int "Maximum scheduler frontier size"
+	range 64 4096
+	default 512
+
+endmenu
diff --git a/campaign/fixtures/b1/liquid/sample.liquid b/campaign/fixtures/b1/liquid/sample.liquid
new file mode 100644
index 000000000..71fba5c37
--- /dev/null
+++ b/campaign/fixtures/b1/liquid/sample.liquid
@@ -0,0 +1,7 @@
+{% assign passing = site.languages | where: "status", "PASS" %}
+<h2>{{ passing.size }} languages pass</h2>
+<ul>
+{% for lang in passing %}
+  <li>{{ lang.name }} — {{ lang.mechanism | default: "byte-exact" }}</li>
+{% endfor %}
+</ul>
diff --git a/campaign/fixtures/b1/make/Makefile b/campaign/fixtures/b1/make/Makefile
new file mode 100644
index 000000000..9b74e4010
--- /dev/null
+++ b/campaign/fixtures/b1/make/Makefile
@@ -0,0 +1,10 @@
+CENSUS ?= full
+TAGS := gts_parsercorephase0
+
+.PHONY: census
+census:
+	GTS_ADMISSION_SCORECARD=1 GTS_ADMISSION_CENSUS=1 \
+	go test -tags $(TAGS) -run TestAdmissionCandidateScorecard206 -v .
+
+clean:
+	rm -rf campaign/out
diff --git a/campaign/fixtures/b1/matlab/classify.m b/campaign/fixtures/b1/matlab/classify.m
new file mode 100644
index 000000000..35e82335d
--- /dev/null
+++ b/campaign/fixtures/b1/matlab/classify.m
@@ -0,0 +1,11 @@
+function out = classify(status)
+%CLASSIFY Map a raw status to its census bucket.
+switch lower(status)
+    case 'pass'
+        out = 'PASS';
+    case {'fallback', 'skip'}
+        out = 'DECLINE';
+    otherwise
+        out = 'UNKNOWN';
+end
+end
diff --git a/campaign/fixtures/b1/mermaid/sample.mmd b/campaign/fixtures/b1/mermaid/sample.mmd
new file mode 100644
index 000000000..918b8637a
--- /dev/null
+++ b/campaign/fixtures/b1/mermaid/sample.mmd
@@ -0,0 +1,7 @@
+graph TD
+    A[Smoke fixture] --> B{Compact route}
+    B -->|accept| C[PASS]
+    B -->|decline| D[FALLBACK]
+    D --> E[repetition-shift-class]
+    D --> F[zero-width-shift]
+    D --> G[eof-byte-short-frontier]
diff --git a/campaign/fixtures/b1/nushell/sample.nu b/campaign/fixtures/b1/nushell/sample.nu
new file mode 100644
index 000000000..7d843946e
--- /dev/null
+++ b/campaign/fixtures/b1/nushell/sample.nu
@@ -0,0 +1,7 @@
+def census [] {
+    ls campaign/fixtures/b1
+    | where type == dir
+    | each { |row| $row.name }
+    | length
+}
+census
diff --git a/campaign/fixtures/b1/odin/main.odin b/campaign/fixtures/b1/odin/main.odin
new file mode 100644
index 000000000..8ef13e410
--- /dev/null
+++ b/campaign/fixtures/b1/odin/main.odin
@@ -0,0 +1,14 @@
+package census
+
+import "core:fmt"
+
+classify :: proc(status: Status) -> string {
+	switch status {
+	case .Pass:    return "PASS"
+	case .Fallack: return "FALLBACK"
+	case .Skip:    return "SKIP"
+	}
+	return "UNKNOWN"
+}
+
+main :: proc() { fmt.println(classify(.Pass)) }
diff --git a/campaign/fixtures/b1/pascal/census.pas b/campaign/fixtures/b1/pascal/census.pas
new file mode 100644
index 000000000..5c11097b3
--- /dev/null
+++ b/campaign/fixtures/b1/pascal/census.pas
@@ -0,0 +1,9 @@
+program Census;
+type
+  TStatus = (stPass, stFallback, stSkip);
+var
+  s: TStatus;
+begin
+  for s := Low(TStatus) to High(TStatus) do
+    WriteLn(Ord(s));
+end.
diff --git a/campaign/fixtures/b1/prolog/census.pl b/campaign/fixtures/b1/prolog/census.pl
new file mode 100644
index 000000000..b7de291eb
--- /dev/null
+++ b/campaign/fixtures/b1/prolog/census.pl
@@ -0,0 +1,6 @@
+:- module(census, [classify/2]).
+
+classify(pass, pass).
+classify(fallback, decline).
+classify(skip, decline).
+classify(_, unknown).
diff --git a/campaign/fixtures/b1/purescript/Main.purs b/campaign/fixtures/b1/purescript/Main.purs
new file mode 100644
index 000000000..b7c8f4b63
--- /dev/null
+++ b/campaign/fixtures/b1/purescript/Main.purs
@@ -0,0 +1,9 @@
+module Census.Main where
+
+import Prelude
+
+classify :: String -> String
+classify = case _ of
+  "pass" -> "PASS"
+  "skip" -> "SKIP"
+  _ -> "FALLBACK"
diff --git a/campaign/fixtures/b1/requirements/requirements.txt b/campaign/fixtures/b1/requirements/requirements.txt
new file mode 100644
index 000000000..3e640490b
--- /dev/null
+++ b/campaign/fixtures/b1/requirements/requirements.txt
@@ -0,0 +1,4 @@
+# pinned for the depth-census runner
+pytest==8.2.0
+pyyaml==6.0.1
+tree-sitter==0.22.3
diff --git a/campaign/fixtures/b1/run-depth-census.sh b/campaign/fixtures/b1/run-depth-census.sh
new file mode 100644
index 000000000..1f319334e
--- /dev/null
+++ b/campaign/fixtures/b1/run-depth-census.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+# B1 depth census driver: builds the 48-fixture manifest from
+# campaign/b1-depth-fixtures.md rows and runs the shipped real-corpus
+# admission matrix (the depth driver) with fine-grained census classification.
+set -e
+cd "$(dirname "$0")/../../.."
+python3 - <<'EOF'
+import json, os
+rows = [
+ ("bash","cgo_harness/docker/run_forest_corpus_parity.sh"),
+ ("beancount","campaign/fixtures/b1/beancount/sample.beancount"),
+ ("bitbake","testdata/dispatcher_census_a0/bitbake/large__linux-firmware_20260519.bb"),
+ ("chatito","campaign/fixtures/b1/chatito/sample.chatito"),
+ ("commonlisp","campaign/fixtures/b1/commonlisp/sample.lisp"),
+ ("crystal","campaign/fixtures/b1/crystal/sample.cr"),
+ ("csv","campaign/fixtures/b1/csv/sample.csv"),
+ ("cylc","campaign/fixtures/b1/cylc/sample.cylc"),
+ ("desktop","campaign/fixtures/b1/desktop/sample.desktop"),
+ ("disassembly","campaign/fixtures/b1/disassembly/sample.disassembly"),
+ ("dockerfile","cgo_harness/docker/Dockerfile"),
+ ("dtd","testdata/dispatcher_census_a0/dtd/large__docbook.dtd"),
+ ("earthfile","campaign/fixtures/b1/earthfile/Earthfile"),
+ ("editorconfig","campaign/fixtures/b1/editorconfig/sample.editorconfig"),
+ ("elixir","testdata/admission_direct/recursive_insert/elixir.ex"),
+ ("fish","campaign/fixtures/b1/fish/sample.fish"),
+ ("git_config","campaign/fixtures/b1/git_config/sample.gitconfig"),
+ ("git_rebase","campaign/fixtures/b1/git_rebase/sample.gitrebase"),
+ ("gitcommit","campaign/fixtures/b1/gitcommit/sample.commitmsg"),
+ ("go","cgo_harness/corpus_structural/go_sample.go"),
+ ("gomod","cgo_harness/go.mod"),
+ ("hcl","campaign/fixtures/b1/hcl/main.hcl"),
+ ("hyprlang","campaign/fixtures/b1/hyprlang/sample.conf"),
+ ("ini","testdata/dispatcher_census_a0/doxygen/small__example.cfg"),
+ ("julia","testdata/compact_selected_lineage/julia_utils.jl"),
+ ("kconfig","campaign/fixtures/b1/kconfig/Kconfig.census"),
+ ("ledger","testdata/dispatcher_census_a0/ledger/small__non-profit-test-data.ledger"),
+ ("liquid","campaign/fixtures/b1/liquid/sample.liquid"),
+ ("make","campaign/fixtures/b1/make/Makefile"),
+ ("markdown","corpuscheck/testdata/upstream_corpus/NOTICE.md"),
+ ("matlab","campaign/fixtures/b1/matlab/classify.m"),
+ ("mermaid","campaign/fixtures/b1/mermaid/sample.mmd"),
+ ("ninja","testdata/dispatcher_census_a0/ninja/small__long-slow-build.ninja"),
+ ("nushell","campaign/fixtures/b1/nushell/sample.nu"),
+ ("odin","campaign/fixtures/b1/odin/main.odin"),
+ ("pascal","campaign/fixtures/b1/pascal/census.pas"),
+ ("prolog","campaign/fixtures/b1/prolog/census.pl"),
+ ("purescript","campaign/fixtures/b1/purescript/Main.purs"),
+ ("requirements","campaign/fixtures/b1/requirements/requirements.txt"),
+ ("svelte","testdata/admission_direct/svelte_button.svelte"),
+ ("tcl","campaign/fixtures/b1/tcl/census.tcl"),
+ ("templ","testdata/dispatcher_census_a0/templ/medium__main.templ"),
+ ("tmux","campaign/fixtures/b1/tmux/sample.tmux.conf"),
+ ("twig","campaign/fixtures/b1/twig/sample.twig"),
+ ("uxntal","campaign/fixtures/b1/uxntal/census.tal"),
+ ("v","campaign/fixtures/b1/v/main.v"),
+ ("vimdoc","campaign/fixtures/b1/vimdoc/census.txt"),
+ ("xml","campaign/fixtures/b1/xml/corpus-entry.xml"),
+]
+entries=[]
+missing=[]
+for lang,p in rows:
+    if not os.path.exists(p):
+        missing.append((lang,p)); continue
+    entries.append({"language":lang,"bucket":"b1-depth","bytes":os.path.getsize(p),"output_path":p})
+print("missing:",missing)
+json.dump({"entries":entries},open("campaign/fixtures/b1/depth-manifest.json","w"),indent=2)
+print("entries:",len(entries))
+EOF
+GTS_ADMISSION_REAL_CORPUS=1 GTS_ADMISSION_REAL_CORPUS_MANIFEST=campaign/fixtures/b1/depth-manifest.json \
+GTS_ADMISSION_CENSUS=1 \
+go test -tags gts_parsercorephase0 -run TestAdmissionCandidateRealCorpusMatrix -v . \
+  | tee campaign/fixtures/b1/depth-census-run.log
diff --git a/campaign/fixtures/b1/tcl/census.tcl b/campaign/fixtures/b1/tcl/census.tcl
new file mode 100644
index 000000000..2670c412e
--- /dev/null
+++ b/campaign/fixtures/b1/tcl/census.tcl
@@ -0,0 +1,9 @@
+proc classify {status} {
+    switch -exact -- $status {
+        pass      { return PASS }
+        fallback  -
+        skip      { return DECLINE }
+        default   { return UNKNOWN }
+    }
+}
+puts [classify pass]
diff --git a/campaign/fixtures/b1/tmux/sample.tmux.conf b/campaign/fixtures/b1/tmux/sample.tmux.conf
new file mode 100644
index 000000000..44513bdbc
--- /dev/null
+++ b/campaign/fixtures/b1/tmux/sample.tmux.conf
@@ -0,0 +1,4 @@
+set -g base-index 1
+setw -g aggressive-resize on
+bind r source-file ~/.tmux.conf \; display "reloaded"
+set -g status-style bg=black,fg=cyan
diff --git a/campaign/fixtures/b1/twig/sample.twig b/campaign/fixtures/b1/twig/sample.twig
new file mode 100644
index 000000000..17e30da98
--- /dev/null
+++ b/campaign/fixtures/b1/twig/sample.twig
@@ -0,0 +1,8 @@
+{% extends "layout.html.twig" %}
+{% block body %}
+<table class="census">
+{% for lang in languages %}
+  <tr><td>{{ lang.name }}</td><td>{{ lang.depthStatus }}</td></tr>
+{% endfor %}
+</table>
+{% endblock %}
diff --git a/campaign/fixtures/b1/uxntal/census.tal b/campaign/fixtures/b1/uxntal/census.tal
new file mode 100644
index 000000000..3766f1c06
--- /dev/null
+++ b/campaign/fixtures/b1/uxntal/census.tal
@@ -0,0 +1,8 @@
+( classify: 0=PASS 1=FALLBACK )
+|0100 @on-reset
+    #01 classify
+    #18 DEO
+    BRK
+
+@classify ( status -- class )
+    #01 AND JMP2r
diff --git a/campaign/fixtures/b1/v/main.v b/campaign/fixtures/b1/v/main.v
new file mode 100644
index 000000000..7e6644185
--- /dev/null
+++ b/campaign/fixtures/b1/v/main.v
@@ -0,0 +1,16 @@
+module census
+
+struct Language {
+	name   string
+	status string
+}
+
+fn classify(status string) string {
+	return match status {
+		'pass' { 'PASS' }
+		'skip' { 'SKIP' }
+		else   { 'FALLBACK' }
+	}
+}
+
+fn main() { println(classify('pass')) }
diff --git a/campaign/fixtures/b1/vimdoc/census.txt b/campaign/fixtures/b1/vimdoc/census.txt
new file mode 100644
index 000000000..72966a2ff
--- /dev/null
+++ b/campaign/fixtures/b1/vimdoc/census.txt
@@ -0,0 +1,11 @@
+*census.txt*  Fine-grained decline mechanism census
+
+INTRO                                    *census-intro*
+The admission scorecard sorts all 206 registered grammars into five
+buckets. See |scorecard| for the command.
+
+COMMANDS                                 *census-commands*
+:CensusRun       Run the full 206-language scorecard.
+:CensusDepth     Rerun currently-PASSING languages on real corpora.
+
+vim:tw=78:ts=8:noet:ft=help:norl:
diff --git a/campaign/fixtures/b1/xml/corpus-entry.xml b/campaign/fixtures/b1/xml/corpus-entry.xml
new file mode 100644
index 000000000..451499393
--- /dev/null
+++ b/campaign/fixtures/b1/xml/corpus-entry.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<census date="2026-08-23">
+  <bucket name="PASS" count="48"/>
+  <bucket name="FALLBACK" count="153">
+    <mechanism name="eof-byte-short-frontier" count="90"/>
+    <mechanism name="zero-width-shift" count="33"/>
+    <mechanism name="repetition-shift-class" count="27"/>
+  </bucket>
+</census>
diff --git a/campaign/fixtures/make_b1_fixtures.sh b/campaign/fixtures/make_b1_fixtures.sh
new file mode 100644
index 000000000..6c9c8410c
--- /dev/null
+++ b/campaign/fixtures/make_b1_fixtures.sh
@@ -0,0 +1,398 @@
+#!/bin/sh
+set -e
+cd /home/draco/work/gts-campaign-20260823
+B=campaign/fixtures/b1
+mkdir -p $(find campaign/fixtures -maxdepth 0); for d in beancount chatito commonlisp crystal csv cylc desktop disassembly earthfile editorconfig fish git_config git_rebase gitcommit hcl hyprlang kconfig liquid make matlab mermaid nushell odin pascal purescript prolog requirements tcl tmux twig uxntal v vimdoc xml; do mkdir -p "$B/$d"; done
+
+cat > $B/beancount/sample.beancount <<'EOF'
+2026-07-01 * "Grocery run"
+  Expenses:Food:Groceries      42.17 USD
+  Assets:Checking
+
+2026-07-03 open Assets:Checking
+2026-07-05 pad Assets:Checking Equity:Opening-Balances
+2026-07-31 balance Assets:Checking 1204.55 USD
+EOF
+
+cat > $B/chatito/sample.chatito <<'EOF'
+intent orderDrink
+training order a latte
+training can I get an espresso
+@
+    drink [latte] @id(1)
+EOF
+
+cat > $B/commonlisp/sample.lisp <<'EOF'
+(defpackage #:census
+  (:use #:cl)
+  (:export #:classify))
+(in-package #:census)
+
+(defun classify (status)
+  "Map a raw status keyword to its census bucket."
+  (case status
+    ((pass) :pass)
+    ((fallback skip) :decline)
+    (t :unknown)))
+EOF
+
+cat > $B/crystal/sample.cr <<'EOF'
+class Census
+  property counts = Hash(String, Int32).new(0)
+
+  def bump(lang : String)
+    @counts[lang] += 1
+  end
+
+  def total : Int32
+    @counts.values.sum
+  end
+end
+
+puts Census.new.tap { |c| c.bump("crystal") }.total
+EOF
+
+cat > $B/csv/sample.csv <<'EOF'
+language,status,mechanism,bytes
+go,PASS,,12438
+bash,FALLBACK,zero-width-shift,6239
+xml,FALLBACK,repetition-shift-class,480
+EOF
+
+cat > $B/cylc/sample.cylc <<'EOF'
+[scheduling]
+    initial cycle point = 20260701T00Z
+    [[graph]]
+        R1 = prep => census => report
+
+[runtime]
+    [[census]]
+        script = python3 run_census.py --full
+EOF
+
+cat > $B/desktop/sample.desktop <<'EOF'
+[Desktop Entry]
+Type=Application
+Name=Census Runner
+Exec=/usr/local/bin/run-census --full
+Icon=utilities-terminal
+Terminal=true
+Categories=Development;
+EOF
+
+cat > $B/disassembly/sample.disassembly <<'EOF'
+0000000000401000 <classify>:
+  401000:	55                   	push   %rbp
+  401001:	48 89 e5             	mov    %rsp,%rbp
+  401004:	89 f8                	mov    %edi,%eax
+  401006:	83 f8 01             	cmp    $0x1,%eax
+  401009:	74 05                	je     401010 <pass>
+  40100b:	b8 02 00 00 00       	mov    $0x2,%eax
+  401010:	5d                   	pop    %rbp
+  401011:	c3                   	retq
+EOF
+
+cat > $B/earthfile/Earthfile <<'EOF'
+VERSION 0.8
+FROM alpine:3.19
+build:
+    RUN apk add go git
+    COPY . .
+    RUN go build ./...
+save-artifact census
+EOF
+
+cat > $B/editorconfig/sample.editorconfig <<'EOF'
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+
+[*.go]
+indent_style = tab
+indent_size = 4
+EOF
+
+cat > $B/fish/sample.fish <<'EOF'
+function census
+    set -l langs (ls grammars | string match -r '^[a-z]+')
+    for lang in $langs
+        echo "checking $lang"
+    end
+end
+census | grep checking | wc -l
+EOF
+
+cat > $B/git_config/sample.gitconfig <<'EOF'
+[user]
+	name = Draco
+	email = draco@example.com
+[core]
+	editor = vim
+	autocrlf = input
+[alias]
+	lg = log --oneline --graph -20
+EOF
+
+cat > $B/git_rebase/sample.gitrebase <<'EOF'
+pick af9ded2b Merge pull request #897
+pick 7a43c9cb Add admission census classifier
+squash 41d0e77 Fix trailing-newline frontier offset
+pick 9c21aa0 Update coverage docs
+EOF
+
+cat > $B/gitcommit/sample.commitmsg <<'EOF'
+admission: add fine-grained decline mechanism census
+
+Split the two coarse FALLBACK buckets into eleven mechanism classes,
+gated behind GTS_ADMISSION_CENSUS=1 so every default-build call site
+stays byte-identical.
+
+PASS=48 DIVERGE=0 FALLBACK=153 SKIP=5 ERROR=0 total=206
+EOF
+
+cat > $B/hcl/main.hcl <<'EOF'
+variable "region" {
+  type    = string
+  default = "us-east-1"
+}
+
+resource "aws_s3_bucket" "corpus" {
+  bucket = "depth-census-${var.region}"
+  tags = {
+    owner = "census"
+    tier  = "evidence"
+  }
+}
+EOF
+
+cat > $B/hyprlang/sample.conf <<'EOF'
+monitor=eDP-1,1920x1080@60,0x0,1
+input {
+    kb_layout = us
+    repeat_rate = 40
+}
+bind = SUPER, Return, exec, kitty
+EOF
+
+cat > $B/kconfig/Kconfig.census <<'EOF'
+menu "Census options"
+
+config GTS_ADMISSION_CENSUS
+	bool "Enable fine-grained admission decline census"
+	default n
+	help
+	  Tag every compact-route decline with its mechanism class.
+
+config GTS_MAX_FRONTIER
+	int "Maximum scheduler frontier size"
+	range 64 4096
+	default 512
+
+endmenu
+EOF
+
+cat > $B/liquid/sample.liquid <<'EOF'
+{% assign passing = site.languages | where: "status", "PASS" %}
+<h2>{{ passing.size }} languages pass</h2>
+<ul>
+{% for lang in passing %}
+  <li>{{ lang.name }} — {{ lang.mechanism | default: "byte-exact" }}</li>
+{% endfor %}
+</ul>
+EOF
+
+cat > $B/make/Makefile <<'EOF'
+CENSUS ?= full
+TAGS := gts_parsercorephase0
+
+.PHONY: census
+census:
+	GTS_ADMISSION_SCORECARD=1 GTS_ADMISSION_CENSUS=1 \
+	go test -tags $(TAGS) -run TestAdmissionCandidateScorecard206 -v .
+
+clean:
+	rm -rf campaign/out
+EOF
+
+cat > $B/matlab/classify.m <<'EOF'
+function out = classify(status)
+%CLASSIFY Map a raw status to its census bucket.
+switch lower(status)
+    case 'pass'
+        out = 'PASS';
+    case {'fallback', 'skip'}
+        out = 'DECLINE';
+    otherwise
+        out = 'UNKNOWN';
+end
+end
+EOF
+
+cat > $B/mermaid/sample.mmd <<'EOF'
+graph TD
+    A[Smoke fixture] --> B{Compact route}
+    B -->|accept| C[PASS]
+    B -->|decline| D[FALLBACK]
+    D --> E[repetition-shift-class]
+    D --> F[zero-width-shift]
+    D --> G[eof-byte-short-frontier]
+EOF
+
+cat > $B/nushell/sample.nu <<'EOF'
+def census [] {
+    ls campaign/fixtures/b1
+    | where type == dir
+    | each { |row| $row.name }
+    | length
+}
+census
+EOF
+
+cat > $B/odin/main.odin <<'EOF'
+package census
+
+import "core:fmt"
+
+classify :: proc(status: Status) -> string {
+	switch status {
+	case .Pass:    return "PASS"
+	case .Fallack: return "FALLBACK"
+	case .Skip:    return "SKIP"
+	}
+	return "UNKNOWN"
+}
+
+main :: proc() { fmt.println(classify(.Pass)) }
+EOF
+
+cat > $B/pascal/census.pas <<'EOF'
+program Census;
+type
+  TStatus = (stPass, stFallback, stSkip);
+var
+  s: TStatus;
+begin
+  for s := Low(TStatus) to High(TStatus) do
+    WriteLn(Ord(s));
+end.
+EOF
+
+cat > $B/purescript/Main.purs <<'EOF'
+module Census.Main where
+
+import Prelude
+
+classify :: String -> String
+classify = case _ of
+  "pass" -> "PASS"
+  "skip" -> "SKIP"
+  _ -> "FALLBACK"
+EOF
+
+cat > $B/prolog/census.pl <<'EOF'
+:- module(census, [classify/2]).
+
+classify(pass, pass).
+classify(fallback, decline).
+classify(skip, decline).
+classify(_, unknown).
+EOF
+
+cat > $B/requirements/requirements.txt <<'EOF'
+# pinned for the depth-census runner
+pytest==8.2.0
+pyyaml==6.0.1
+tree-sitter==0.22.3
+EOF
+
+cat > $B/tcl/census.tcl <<'EOF'
+proc classify {status} {
+    switch -exact -- $status {
+        pass      { return PASS }
+        fallback  -
+        skip      { return DECLINE }
+        default   { return UNKNOWN }
+    }
+}
+puts [classify pass]
+EOF
+
+cat > $B/tmux/sample.tmux.conf <<'EOF'
+set -g base-index 1
+setw -g aggressive-resize on
+bind r source-file ~/.tmux.conf \; display "reloaded"
+set -g status-style bg=black,fg=cyan
+EOF
+
+cat > $B/twig/sample.twig <<'EOF'
+{% extends "layout.html.twig" %}
+{% block body %}
+<table class="census">
+{% for lang in languages %}
+  <tr><td>{{ lang.name }}</td><td>{{ lang.depthStatus }}</td></tr>
+{% endfor %}
+</table>
+{% endblock %}
+EOF
+
+cat > $B/uxntal/census.tal <<'EOF'
+( classify: 0=PASS 1=FALLBACK )
+|0100 @on-reset
+    #01 classify
+    #18 DEO
+    BRK
+
+@classify ( status -- class )
+    #01 AND JMP2r
+EOF
+
+cat > $B/v/main.v <<'EOF'
+module census
+
+struct Language {
+	name   string
+	status string
+}
+
+fn classify(status string) string {
+	return match status {
+		'pass' { 'PASS' }
+		'skip' { 'SKIP' }
+		else   { 'FALLBACK' }
+	}
+}
+
+fn main() { println(classify('pass')) }
+EOF
+
+cat > $B/vimdoc/census.txt <<'EOF'
+*census.txt*  Fine-grained decline mechanism census
+
+INTRO                                    *census-intro*
+The admission scorecard sorts all 206 registered grammars into five
+buckets. See |scorecard| for the command.
+
+COMMANDS                                 *census-commands*
+:CensusRun       Run the full 206-language scorecard.
+:CensusDepth     Rerun currently-PASSING languages on real corpora.
+
+vim:tw=78:ts=8:noet:ft=help:norl:
+EOF
+
+cat > $B/xml/corpus-entry.xml <<'EOF'
+<?xml version="1.0" encoding="UTF-8"?>
+<census date="2026-08-23">
+  <bucket name="PASS" count="48"/>
+  <bucket name="FALLBACK" count="153">
+    <mechanism name="eof-byte-short-frontier" count="90"/>
+    <mechanism name="zero-width-shift" count="33"/>
+    <mechanism name="repetition-shift-class" count="27"/>
+  </bucket>
+</census>
+EOF
+
+echo done
+find $B -type f | wc -l
\ No newline at end of file
diff --git a/campaign/smoke-census-summary.md b/campaign/smoke-census-summary.md
new file mode 100644
index 000000000..496b7cb22
--- /dev/null
+++ b/campaign/smoke-census-summary.md
@@ -0,0 +1,3 @@
+# Smoke census summary
+
+The 2026-07-20 compact-route coverage census (base commit `7a43c9cb`) ran the Phase-3 admission scorecard across all 206 registered grammars, reporting 48 byte-exact PASS, 0 DIVERGE, 153 FALLBACK, 5 SKIP (token-source grammars: authzed, c, cpp, java, json), and 0 ERROR. A new opt-in classification layer (`admission_census.go`, gated behind the `gts_parsercorephase0` build tag and `GTS_ADMISSION_CENSUS=1`) broke the 153 FALLBACK languages into eleven fine-grained mechanism classes, dominated by `eof-byte-short-frontier` (90, later shown to be a single-byte trailing-newline gap rather than multi-derivation), `zero-width-shift` (33), and the documented missing feature `repetition-shift-class` (27). The prior coarse framing of the 90-language bucket as multi-derivation was corrected: every one of those declines has exactly one derivation and one accept action, failing only because the accepted head's boundary ends one byte short of the source. A depth check reran ten currently-PASSING languages against real corpus files and found that nine of ten (all but Go) lost PASS status — failing closed via `repetition-shift-class` or `zero-width-shift` rather than diverging — so the 48-PASS headline does not predict real-file coverage outside Go. The priority-corrected burn-down order is therefore `zero-width-shift` and `repetition-shift-class` first (they block flagship languages like JavaScript, TypeScript, Python, Ruby, Elixir, XML, and Dockerfile at depth), followed by `eof-byte-short-frontier` as a certain but fixture-only win.