refactor(skills): retrofit the corpus to the ADR-0020 context contract (#129)

Retrofits all 39 skills to ADR-0020's description/body context contract, then fixes what six rounds of independent review found in that retrofit — including four ways the hot gate itself failed open.

Closes #99, #107, #108, #110, #111, #114, #115, #120.

## The retrofit (waves 1-5)

| | Start | Now |
|---|---|---|
| Description FAILs (>400 chars) | 26 | **0** |
| Body FAILs (>900 words, body-only) | 9 | **0** |
| Dangling routing targets | 2 | **0** |
| `Kyberforge.CompositionNote` | 10 | **0** |
| Preload tax | 21,005 chars | **~10,500** |

Under the 12,000-char success criterion. Per-wave detail is on #99.

## The review fixes

**The gate failed open four ways, three of them found after the retrofit shipped.** An unrecognised follower token made a dangling target vanish. A skill directory with no `SKILL.md` resolved as a valid target, so a commit could be green locally and red in a fresh clone — three existing fixtures were relying on that, one of which made the install-leak A/B pass vacuously. Then the free-standing `/name` sweep turned out to be gated on the sentence carrying a boundary marker, so route notation in any other sentence was invisible — not an ERROR, not a SUGGESTION, not an INFO — which left the documented "`/name` always blocks" promise false from a second direction. All four fixed and pinned.

**Two checks were silently not running.** `validate-provenance.sh` checks 7-8 were dead across nine skills. Waking them exposed a deeper problem: they assume `Research doc:` names a source index, but 30 of 121 entries point at topic content documents, so every new check-7 INFO was a false positive and check 8 was saved from a false-FAIL flood only by an *unannounced* skip. Checks 7/8 are now scoped to source indexes and every skip announces itself (#121).

**The retrofit's own anti-goal, four times.** ADR-0020 warns that a blunt gate gets satisfied by deleting content rather than relocating it. `diagnose` and `skill-audit` relocated prose and then read it unconditionally; `prototype` and `vale-config` deleted rules outright that survived nowhere. All four addressed.

## Verification

- `bash tests/run-tests.sh --strict` — 24 suites, 0 skipped, 0 failed
- `bash tests/run-bats.sh` — 325 tests, 0 failures
- `pre-commit run --all-files` — 17/17
- `pre-commit run --hook-stage pre-push --all-files` — 16/16, with `apm marketplace check` and `apm pack --check-clean` run against the remote, not skipped
- `scripts/skill-size-check.sh` over all 39 skills — rc 0, 0 ERROR/FAIL, SUGGESTION-only
- Preload tax measured at **10,498 chars**, max description 390 — both inside budget
- Every new test proven non-vacuous by a deliberate mutation of the behaviour it covers

**Per-commit sync, stated accurately:** the ten commits from the latest review round each pass `check-plugin-content-sync` in isolation, verified by checking each out in a detached worktree with a clean between. The earlier gitea window (`dfacf05..bedbd1d`, nine commits) does **not** — its mirror was regenerated in one batch at `bbc7300`. An earlier revision of this description claimed the property held for every commit; it does not, and a bisect through that window lands on a red commit. **Squash-merge** to collapse it, or accept that this range is not bisectable.

## Version bump

Six plugins and the catalog take a **patch**, not a minor. The branch is **89 commits — 40 `fix` / 30 `refactor` / 12 `docs` / 5 `chore` / 2 `test` — zero `feat`, zero `!`, zero `BREAKING CHANGE`** — and adds no skill, agent, command or hook. (Two earlier revisions of this section cited a stale histogram, most recently 78 commits; the figures above are measured at HEAD.) Both rules this repo ships (`forge/references/version-bump.md`, landing in this PR, and `git-commits/references/conventional-commits-spec.md`) make that a patch, and the catalog set is unchanged at 7 entries.

Not settled by that: four published files were removed from the installed tree, three moved, and `caveman` gained `disable-model-invocation`, retiring its old triggers. Under a strict reading those are major-class and currently ship under `refactor:` with no marker. Whether the deployed skill surface is a public contract is written down nowhere — worth deciding, but it outlives this PR.

## Deliberately not in scope

#112 (cherry-pick ownership, now resolved in favour of `git-commits`), #113 (`rtk git` normalisation), #116 (research fan-out), #101 (audit-skill merge), #122 (non-spec skill-root files), #123 (no PRD producer) stay open. #117 is the one worth reading: the contract's remedy is to move prose into `references/`, which is exactly where neither the size gate nor Vale looks — and the blind spot is wider than #117 currently records, since there is no root `.vale.ini` at all, so every ADR, `CONTEXT.md` and `README.md` is unlinted too.

That blind spot let this branch carry two `level: error` `Kyberforge.SentenceOpenerThereIs` violations into `references/` files it created — `provider-adapter-author/references/provider-matrix.md:31` and `agent-audit/references/finding-criteria.md:95`. Both are reworded in `afadaae`, confirmed by routing each file through the audit's own `vale-wrap.sh` (1 error each before, 0 after). Five further occurrences sit in `references/` files already on `main`; those are the pre-existing corpus and stay with #117, which is the real fix.

Also unfixed and not this PR's: `apm install` appends a duplicate `SessionStart` entry to `.claude/settings.json`, so a fresh clone cannot get pre-push green without an edit AGENTS.md warns against. Reproduces identically on `main`.

Co-authored-by: Defame1297 <gitea@rkdr.net>
Reviewed-on: https://git.dev.rkdr.net/Defame1297/holocron/pulls/129
Co-authored-by: Claude Code AI - Gitea MCP <claude@noreply.git.dev.rkdr.net>
Co-committed-by: Claude Code AI - Gitea MCP <claude@noreply.git.dev.rkdr.net>

plugins/kyberforge/skills/skill-audit/SKILL.md

@@ -30,14 +30,14 @@ Resolve all three paths against this skill's own directory so they work from a r
 ```bash
 bash scripts/validate.sh <skill-dir>
 bash scripts/validate-provenance.sh <skill-dir>
-scripts/vale-wrap.sh <skill-dir>/SKILL.md
+bash scripts/vale-wrap.sh <skill-dir>/SKILL.md
 ```
 
-`validate.sh` findings become the `### Structure` dimension — its FAILs and its SUGGESTIONs both.
+`validate.sh` findings become the `### Structure` dimension — its FAILs and its SUGGESTIONs both, at the tier the script assigned. Report each once; never re-grade one under another dimension. Unresolved boundary targets are where this bites, because their tier turns on notation.
 
 If any of the three cannot run, or exits non-zero for a reason other than findings, read `references/validation-scripts.md` — it carries the manual fallback and the misleading exit codes. Ordinary content FAILs are the expected outcome here and need no fallback.
 
-`validate-provenance.sh` prints nothing on success. Its FAIL and INFO findings become a separate `### Provenance` dimension, and it emits Why and Fix itself — surface those verbatim.
+`validate-provenance.sh` prints nothing on success, so read its exit code before you read its silence. **0** is a genuine pass. **1** means real findings: its FAILs and INFOs become a separate `### Provenance` dimension, and it emits Why and Fix itself — surface those verbatim. **2** means the check never ran — a usage or environment error, reason on stderr, no findings and often no stdout at all. On a 2, report `### Provenance` as unverified and quote the stderr reason. Never grade an exit 2 as a clean pass: empty stdout there means nothing was checked, not that nothing was wrong.
 
 `vale-wrap.sh` applies the bundled `Kyberforge` style as a prefilter. Pass no `--config`; the wrapper locates its own. Every rule is graded `error`, so every alert is a FAIL. Report each one citing its rule ID, filed under the dimension it belongs to, and do not re-derive it by judgment:
 
@@ -53,9 +53,9 @@ Read `SKILL.md`, `README.md`, and every text file under `scripts/`, `references/
 
 ## Step 3 — Qualitative audit
 
-Load a dimension's rubric before judging that dimension. Each is self-contained, and each is grounded in the agentskills.io specification plus the house context-budget contract (ADR-0020).
+Read `references/finding-criteria.md` first — every dimension's FAIL and SUGGESTION criteria. Load the rubric below only for a dimension the criteria put in play: one carrying a candidate finding, or one where the criterion alone does not settle the call.
 
-| Dimension | Read |
+| Dimension | Rubric |
 |---|---|
 | description | `references/description-quality.md` |
 | body-discipline | `references/body-discipline.md` |
@@ -63,7 +63,7 @@ Load a dimension's rubric before judging that dimension. Each is self-contained,
 | file-structure, internal-consistency | `references/file-structure.md` |
 | formatting, scripts | `references/formatting-and-scripts.md` |
 
-Cite file and line number for every finding.
+Each rubric is self-contained and grounded in the agentskills.io specification plus the house context budget (ADR-0020). Cite file and line number for every finding.
 
 ## Step 4 — Report