docs: add canonical archive registry (single list of the ancestors)

CLAUDE.md

@@ -72,6 +72,7 @@ tests/                  pytest suite
   test_hmmm_skill.py           Contract tests for the repo-local hmmm skill
 
 docs/                   Operational notes / handoffs (UCNS-related)
+  archive-registry.md   Canonical list of archived org repos and their successors (add a row when archiving)
 .agents/skills/         Repo-local agent skills (hmmm, meta-module-build, test-build, msdmd)
 .github/workflows/
   sync-libs.yml         Manual + active-cron workflow mirroring a subset of upstream libs into libs/<name>/src (pcea/ptcna/ucns/aimmh; NOT zfae or metapat)

README.md

@@ -83,6 +83,10 @@ See `libs/` for per-library documentation and source links:
 - [`libs/aimmh/`](libs/aimmh/README.md) — AIMMH (five-letter)
 - [`libs/metapat/`](libs/metapat/README.md) — METAPAT (FLAR)
 
+Archived predecessors (edcmbone, pcna, pcta, pcsa, a0replite) are listed with
+their successors in [`docs/archive-registry.md`](docs/archive-registry.md) —
+read-only ancestors; do not build against them.
+
 ---
 
 ## Repository Structure

docs/archive-registry.md

@@ -0,0 +1,38 @@
+# Archive registry — the ancestors
+
+This is the single canonical list of The Interdependency's **archived
+repositories**: repos whose work continues under a successor and which are
+retained read-only for provenance. It lives in the aggregator for the same
+reason the coherence-prime canon and the stack map do — it is org-level fact
+belonging to no single leaf, citable from anywhere without inverting the
+dependency graph (see `docs/chapter-4.md`).
+
+Doctrine:
+
+- **Archive, never delete.** An archived repo is an ancestor: read-only,
+  tombstoned, and permanently citable as provenance.
+- **Tombstone before (or with) archival.** The first lines of an archived
+  repo's `README.md` name the archival date and the successor.
+- **Do not build against an ancestor.** Successors carry the maintained code;
+  ancestors carry the history.
+- **Rescue before archival.** Any content absent from the successor is copied
+  there first, with provenance, or the absence is recorded as deliberate.
+- **Add a row here in the same change that archives a repo.**
+
+## Registry
+
+| Archived repo | Date | Successor | Notes |
+|---|---|---|---|
+| `edcmbone` | 2026-07-28 | [`edcm`](https://github.com/The-Interdependency/edcm) | L0 text-primitive layer absorbed into `edcm/measurement/` (frozen canon data, parser, metrics, compress, closed-token layer). Consolidation provenance pinned machine-readably in `edcm`'s `MEASUREMENT_AUTHORITY` record (`edcmbone-provenance-only-v1`). |
+| `pcna` | 2026-07-28 | [`ptcna`](https://github.com/The-Interdependency/ptcna) | Neural layer of the consolidated stack (`ptcna.neural`). Rescued before archival: `scripts/proof_check.py` (spectral relabeling-equivalence check on the n=7 circulants — not evidence for the 7:3 choice). The old app server (`backend/`, `frontend/`) was deliberately not migrated. |
+| `pcta` | 2026-07-28 | [`ptcna`](https://github.com/The-Interdependency/ptcna) | Seed layer of the consolidated stack (`ptcna.seed`). Fully superseded; diffs vs the successor are the recorded consolidation refactors only. |
+| `pcsa` | 2026-07-28 | [`ptcna`](https://github.com/The-Interdependency/ptcna) | Core layer of the consolidated stack (`ptcna.core`, incl. `prime_core` fiqs). Rescued before archival: the stratified-core design notes, now `ptcna/core/prime_core/PROVENANCE.md` (historical; subordinate to the root gradient invariant). |
+| `a0replite` | 2026-07-28 | [`a0`](https://github.com/The-Interdependency/a0) | Replit deployment lane; stale 112 days at archival. Remaining Replit references in `a0` (`README.md`, `replit.md`, `DEPLOYMENT.md`, and the `replit.interdependentway.org` hostname) are a separate, still-open edit pass. |
+
+## hmmm
+
+- `odysseus-a0` is stale with no identified successor; its disposition is
+  deliberately unresolved (maintainer decision, not an agent's) and it is
+  **not** an ancestor until that decision is made.
+- This registry records org-level archival facts only; it transfers no
+  license, theorem, proof, or empirical status between repositories.