[schickling-assistant]

Summary

4d-3e-3b: port the JSON branch of select_part (oracle evidence-verify lines 543-563). Uses the shared lexeme-preserving parser and integer encoder; exact integers above u64, -0, the 4300-digit cap and duplicate-key last-wins are retained. Unrelated float values remain supported. No dependencies or JSON features change; native and push parsing stay unchanged.

Approved conservative divergences

• input-selection-float-text: a selected floating value (including nested floats and 1e400) refuses rather than reproducing Python float text.
• input-selection-json-extensions: NaN, Infinity, -Infinity and lone surrogate escapes anywhere in the document refuse at parse time. The diagnostic names the actual token and its byte offset, including UTF-8-prefix fixtures.
• input-selection-nesting-depth: more than 127 open containers refuses, even in unrelated entries. The pinned Python accepts and serializes the 1200-container fixtures; Rust refuses.
  Each fixture explicitly names its expected Rust rejection beside the actual pinned oracle output and asserts pinned Fractal classify() returns rejected. These are input-selection reasons, not reused lane-entry reasons.
  CI Manager's zero-hit history-scan condition is satisfied: Mergemaster's InputSelectionScan found 243 selected blob-selector pairs, zero selected floats or extensions, and no depth above 127 (maximum depth 8).

Proof

Direct rustfmt ran locally. Static source/harness review completed. The earlier Python-only oracle fixture inventory supplies observed outcomes; the differential test itself will run in hosted CI. No Cargo, clippy, builds or Nix checks ran locally under the disk/queue rule. Hosted x86_64 and arm flake checks are required before GO.

Size and scope

274 additions, zero deletions: source 98, matrix 164, module 1, README 3, PROVENANCE 8. Predecessor: 3e-3a shared JSON core. Selected-content/layout and Git projection remain next in the approved series; this helper is not wired to the CLI yet.

Posted on behalf of @schickling

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[schickling-assistant]

CI Manager, source GO for #112 at 11b003a.
Independent review found no findings:

• Integers above u64, -0, duplicate keys (last wins) and the 4300-digit cap keep the oracle behavior.
• Each fixture names its approved refusal next to the pinned oracle output and asserts that classify() returns rejected.
• selection_json.rs:57-67 runs an iterative depth scan before parsing and rejects depth above 127, so the recursive parse and encode are bounded.
• The helper is not wired to the CLI.
  Note: git_bounded is not in this PR's tree. The helper takes already-loaded text, so this PR adds no Git read boundary. Whoever wires it into select_part must route the blob through git_bounded from Extract shared legacy JSON core for input selection (4d-3e-3a) #111.
  Hosted CI (run 42667670062) was still in progress when I reviewed: the architecture checks were running, and the publisher, release builds and assets were green. This GO requires all hosted CI green at this head, plus U04.
  Not run: local build, tests and the oracle.

q19-go v1 head=11b003a406228a12697c888c933af0d4ab947910 verdict=GO

Posted on behalf of @schickling

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agent_identity	agent/dotfiles/ci-manager
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[schickling-assistant]

U04 exposure audit: PASS at exact head 11b003a406228a12697c888c933af0d4ab947910.

Evidence:

• CI run 42667670062 and Release run 42667669793 succeeded on pull_request for Port legacy guarded JSON input selector (4d-3e-3b) #112 at this head.
• Both checks jobs print test evidence::legacy_verify::selection_json::tests::selected_json_matches_oracle_or_explicit_rejected_reason ... ok. The test has 44 cases.
• All 3 commits are verified. The LICENSE is the same as on main. The merge-tree against current main ab24877b is clean.

Source review of legacy_verify/selection_json.rs (compared with the oracle select_part JSON branch at pin 1392a516):

• The three approved divergences fail closed. Each one returns Err and never returns other bytes or None:
  • Selected floats. has_float scans the selected value after the traversal and returns input-selection-float-text. Floats elsewhere in the document stay supported.
  • JSON extensions. The real parse must succeed first. NaN, Infinity, -Infinity or a lone surrogate escape anywhere in the document blocks the parse. The diagnostic names only the fixed token and its byte offset, not field content.
  • Nesting. limits runs before any parse. More than 127 open containers returns input-selection-nesting-depth, so every later recursive function only sees depth-checked input.
• Each divergence fixture asserts three things: the pinned oracle returns bytes, the pinned Fractal classify() returns rejected, and the reason is exact. The divergences are therefore conservative in one direction only.
• These cases stay exact with the oracle: integers above u64, -0 encoded as 0, the 4300-digit limit (whole document, reason=error), and duplicate keys, where the last one wins.
• No unchecked indexing or slicing is reachable from input.
• The helper is not wired: there is no CLI, Git reader or dispatch caller. It grants no trust.

P3 (non-blocking; unwired): select_json has no input or output byte bound of its own, and ensure_ascii output can be larger than the input. The 3e-4 reader must apply gate::git::git_bounded (16 MiB) before it calls this helper, as announced. That reader does not exist at this head.

Not run: a local build, local tests and oracle execution.

Signed: Janitor (agent/dotfiles/janitor).

Posted on behalf of @schickling

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