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/bin/skills/improve-codebase-architecture/README.md

@@ -0,0 +1,36 @@
+# improve-codebase-architecture
+
+Surface architectural friction and propose deepening opportunities — refactors that turn shallow modules into deep ones.
+
+## What it does
+
+Looks for places where a codebase is hard to understand, hard to test, or hard for an agent to navigate, and proposes refactors that concentrate behaviour behind smaller interfaces. It runs in three stages:
+
+1. **Explore.** Reads the domain glossary and any ADRs in the area first, then walks the codebase with an `Explore` sub-agent — organically, noting friction rather than applying fixed heuristics. The **deletion test** is the filter: imagine deleting the module; if complexity vanishes it was a pass-through, if complexity reappears across N callers it was earning its keep.
+2. **Present candidates.** A numbered list, each with files, problem, solution and benefits — benefits stated in terms of *locality* and *leverage* and of how tests would improve. No interfaces are proposed yet; the user picks one.
+3. **Grilling loop.** Walks the design tree for the chosen candidate, with documentation side effects landing inline as decisions crystallise.
+
+The skill is opinionated about vocabulary, and that is the point: **module, interface, implementation, depth, seam, adapter, leverage, locality**, used exactly, with no drift into "component", "service", "API" or "boundary". Domain nouns come from `CONTEXT.md`, architecture nouns from `LANGUAGE.md` — so a proposal reads as "the Order intake module", never "the FooBarHandler".
+
+ADRs are treated as decisions not to be re-litigated. A candidate that contradicts one is surfaced only when the friction is real enough to warrant reopening it, and is marked as such.
+
+## Composition
+
+`diagnose` hands off here when a bug's post-mortem concludes that no correct test seam exists, or that callers are tangled — the recommendation is made after the fix is in, not before. The grilling loop follows `grill-with-docs`'s discipline for `CONTEXT.md` entries and ADR offers, and `SKILL.md` names that skill's format documents directly.
+
+## Usage
+
+```text
+/improve-codebase-architecture
+```
+
+Point at a codebase or an area of one. Expect a numbered candidate list and a "which of these would you like to explore?" before any interface design happens.
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `SKILL.md` | Condensed glossary, key principles, and the three-stage process |
+| `LANGUAGE.md` | Skill-root document, cited throughout `SKILL.md`: full definitions of every term, the words each one replaces, and the full principle list |
+| `INTERFACE-DESIGN.md` | Skill-root document, read at stage 3 when the user wants alternative interfaces explored: the parallel sub-agent "Design It Twice" pattern, framing the problem space, and the per-agent design constraints |
+| `DEEPENING.md` | Skill-root document, cited from `INTERFACE-DESIGN.md`: how to deepen a cluster of shallow modules safely, the four dependency categories (in-process, local-substitutable, remote-but-owned, true external), seam discipline, and the replace-don't-layer testing strategy |

plugins/bin/skills/improve-codebase-architecture/SKILL.md

@@ -1,6 +1,11 @@
 ---
 name: improve-codebase-architecture
-description: Find deepening opportunities in a codebase, informed by the domain language in CONTEXT.md and the decisions in docs/adr/. Use when the user wants to improve architecture, find refactoring opportunities, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable.
+description: >
+  Use when the user wants to improve architecture, find refactoring
+  opportunities, consolidate tightly-coupled modules, or make a codebase more
+  testable and AI-navigable — deepening opportunities that turn shallow modules
+  into deep ones, informed by `CONTEXT.md` and `docs/adr/`. Not debugging a
+  failure -> `diagnose`.
 ---
 
 # Improve Codebase Architecture
@@ -9,7 +14,7 @@ Surface architectural friction and propose **deepening opportunities** — refac
 
 ## Glossary
 
-Use these terms exactly in every suggestion. Consistent language is the point — don't drift into "component," "service," "API," or "boundary." Full definitions in [LANGUAGE.md](LANGUAGE.md).
+Use these terms exactly in every suggestion. Consistent language is the point — don't drift into "component," "service," "API," or "boundary."
 
 - **Module** — anything with an interface and an implementation (function, class, package, slice).
 - **Interface** — everything a caller must know to use the module: types, invariants, error modes, ordering, config. Not just the type signature.
@@ -20,12 +25,14 @@ Use these terms exactly in every suggestion. Consistent language is the point
 - **Leverage** — what callers get from depth.
 - **Locality** — what maintainers get from depth: change, bugs, knowledge concentrated in one place.
 
-Key principles (see [LANGUAGE.md](LANGUAGE.md) for the full list):
+Key principles:
 
 - **Deletion test**: imagine deleting the module. If complexity vanishes, it was a pass-through. If complexity reappears across N callers, it was earning its keep.
 - **The interface is the test surface.**
 - **One adapter = hypothetical seam. Two adapters = real seam.**
 
+If a term or principle above is ambiguous in the case in front of you, or you need the definitions and the principles the two lists leave out, read `LANGUAGE.md`.
+
 This skill is _informed_ by the project's domain model. The domain language gives names to good seams; ADRs record decisions the skill should not re-litigate.
 
 ## Process
@@ -53,7 +60,7 @@ Present a numbered list of deepening opportunities. For each candidate:
 - **Solution** — plain English description of what would change
 - **Benefits** — explained in terms of locality and leverage, and also in how tests would improve
 
-**Use CONTEXT.md vocabulary for the domain, and [LANGUAGE.md](LANGUAGE.md) vocabulary for the architecture.** If `CONTEXT.md` defines "Order," talk about "the Order intake module" — not "the FooBarHandler," and not "the Order service."
+**Use CONTEXT.md vocabulary for the domain, and the architecture glossary above for the architecture.** If `CONTEXT.md` defines "Order," talk about "the Order intake module" — not "the FooBarHandler," and not "the Order service."
 
 **ADR conflicts**: if a candidate contradicts an existing ADR, only surface it when the friction is real enough to warrant revisiting the ADR. Mark it clearly (e.g. _"contradicts ADR-0007 — but worth reopening because…"_). Don't list every theoretical refactor an ADR forbids.
 
@@ -65,7 +72,7 @@ Once the user picks a candidate, drop into a grilling conversation. Walk the des
 
 Side effects happen inline as decisions crystallize:
 
-- **Naming a deepened module after a concept not in `CONTEXT.md`?** Add the term to `CONTEXT.md` — same discipline as `/grill-with-docs` (see [CONTEXT-FORMAT.md](../grill-with-docs/CONTEXT-FORMAT.md)). Create the file lazily if it doesn't exist.
+- **Naming a deepened module after a concept not in `CONTEXT.md`?** Add the term to `CONTEXT.md` — same discipline as `grill-with-docs`, in the format `grill-with-docs`'s `CONTEXT-FORMAT.md` defines. Create the file lazily if it doesn't exist.
 - **Sharpening a fuzzy term during the conversation?** Update `CONTEXT.md` right there.
-- **User rejects the candidate with a load-bearing reason?** Offer an ADR, framed as: _"Want me to record this as an ADR so future architecture reviews don't re-suggest it?"_ Only offer when the reason would actually be needed by a future explorer to avoid re-suggesting the same thing — skip ephemeral reasons ("not worth it right now") and self-evident ones. See [ADR-FORMAT.md](../grill-with-docs/ADR-FORMAT.md).
-- **Want to explore alternative interfaces for the deepened module?** See [INTERFACE-DESIGN.md](INTERFACE-DESIGN.md).
+- **User rejects the candidate with a load-bearing reason?** Offer an ADR, framed as: _"Want me to record this as an ADR so future architecture reviews don't re-suggest it?"_ Only offer when the reason would actually be needed by a future explorer to avoid re-suggesting the same thing — skip ephemeral reasons ("not worth it right now") and self-evident ones. See `grill-with-docs`'s `ADR-FORMAT.md`.
+- **Want to explore alternative interfaces for the deepened module?** Read `INTERFACE-DESIGN.md`.