docs: close the PR #135 documentation review findings

Group 3 of the validated PR #135 review fixes. Every figure and commit
citation below was re-verified at HEAD before being written.

ADR and architecture:
- #7 ADR-0025 cited 61b0b9c, which no published branch reaches. Repointed
  to 620f20b (identical parent tree, reachable from the PR branch), with a
  note that neither is reachable from origin/main. The parser-drift
  paragraph now credits 598a7c3 (the reachable PR #129 squash) and keeps
  484357a only as a pre-squash parenthetical.
- #8 architecture.md dropped the pointer at the LESSONS.md entry this
  branch deleted.
- #9 architecture.md's ADR entry points now name ADR-0015 (the one
  compiler) and ADR-0024, and list ADR-0024 as superseding ADR-0017.
- #10 ADR-0024 section 4 rewritten: the standing patch-bump rule is
  apm-workflow's configure.md, not ADR-0006's, and this change does not
  trigger it. ADR-0015:93 carries a correction for the misattribution.
- N5 ADR-0021 gained a Correction note for the deleted
  scripts/check-manifests.sh (e647f14).

gates.md:
- #11a the four ADR-0020 constants live in lib-checks-skill.sh:313-316 and
  lib-checks-agent.sh:164-165, not in validate.sh.
- #11b the pretty-format-json exclude is two alternations expanding to
  three tracked files, including .claude/apm-hooks.json.
- #11c the ADR-0020 contract suite runs 28 -> 27 -> 29 (620f20b,
  4de5b6b, ef27c97), 29 at HEAD; the unverifiable 25 is dropped.
- #11d the boundary resolver is one copy since ef27c97.
- #12 apm-audit-ci documents the 10 root checks and the 1 plugin check
  apm 0.28.0 actually runs, that content-integrity IS the hidden-Unicode
  scan, that manifest-parse is not a named check, and that the hook needs
  a completed apm install. The offline claim is qualified accordingly.
- N9 gates.md:142-146 verified to still match the hook description.

AGENTS.md:
- #12 the no-network session rule is qualified to a populated
  apm_modules/.

Audit note:
- A1 hook counts corrected to 27/9 -> 26/8 -> 27/9 -> 26/8 (26 and 8 at
  HEAD) and the dangling pointer dropped.
- A2 skill-size-check.sh is 509 lines with the resolver sourced, not 1,522
  embedded; citations repointed to skill-size-check.sh:323-335 and
  lib-checks-skill.sh:235-283 (fail() at :265 and :280), and that library
  is 627 lines.
- A3 consumers receive 15 test files across 5 skills; 16 tracked test
  paths repo-wide.
- A4 the "do not run apm update on this branch" instruction is marked
  superseded, with the branch-aware guidance in its place.
- Finding 31's "true orphans" claim corrected for HOTL and Sycophancy,
  both still used in core/ai-constitution.md.

Same class, found during group 2:
- skill-author's deployment-modes.md no longer points at .mcp.json
  configs (deleted in c96ca9c); metadata.version 1.0.2 -> 1.0.3.
- git-orchestrate's context contract clarifies that
  user_config_overrides is caller-supplied session state, not a config
  read. The field name is unchanged.
- B3 root apm.yml's executables.allow comment: grants are version-blind
  in apm 0.28.0, so the #2.0.0 suffix is cosmetic to apm and a bump does
  not break the hook; the suffix stays because
  check-executables-allow-sync.sh requires it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NwD8Egs5r4ndqeFLmhusX2

docs/adr/0021-plugin-descriptions-state-a-domain-boundary.md

@@ -85,7 +85,15 @@ unnamed in `git`'s corrected description, though `65bac15`'s own commit message
 `gitea`'s. Across the three plugins, 23 of 27 skills are named at the third attempt.
 
 **Nothing checks any of this.** `scripts/check-manifests.sh` does not contain the string
-`description`. The three ADR-0020 validators (`scripts/skill-size-check.sh` and skill-audit's and
+`description`.
+
+**Correction (2026-09-19): that script no longer exists.** `e647f14` deleted
+`scripts/check-manifests.sh` (282 lines), `tests/test-check-manifests.sh` (771 lines) and the
+`check-manifests` pre-commit hook entry with them. The conclusion is unchanged and now holds a
+fortiori: the gate that did not read `description:` is gone, so nothing in its place reads it
+either.
+
+The three ADR-0020 validators (`scripts/skill-size-check.sh` and skill-audit's and
 agent-audit's `validate.sh` — two since ADR-0025 merged the audit pair into `factory-audit`, whose
 single auto-detecting `validate.sh` carries both) gate on SKILL.md and agent frontmatter; they do open `apm.yml`, but only
 to read `dependencies.apm` when resolving the boundary-target universe — none of them reads the