refactor(kyberforge)!: merge skill-audit and agent-audit into factory-audit

Why

The two audit skills carried 1,724 lines of byte-identical duplication: the ADR-0020 boundary
resolver (1,061), vale-wrap.sh (526), the Vale style rules (44) and the Contributing-files parser
(93). Nothing shared them — they were held in sync by a 413-line pre-push gate and its 797-line
test suite. Sync-by-gate had already failed once: at 484357a the two parser copies drifted into
different spellings of the bullet loop while a docstring asserted they were identical. That drift
was behaviour-neutral and was re-unified by hand at 598a7c3, so the copies were identical at merge
time — but nothing had caught it, and the next drift need not be neutral.

Implementation Notes

Self-containment binds BETWEEN skills, not within one. The agentskills.io spec forbids reaching
across skill directories, which is why two separate skills needed embedded copies; two files inside
ONE skill may source a third. That is the whole reason the merge removes duplication rather than
relocating it.

The union of both bodies measured 1,532 words against BODY_MAX_WORDS=900, and only 211 of those
words were shared, so SKILL.md is a dispatch body. Step 0 resolves the flow from the target path
before any validation, and its table mirrors validate.sh's detection exactly: a directory holding
SKILL.md or a SKILL.md file (skill); a *.agent.md, or a .md directly under an agents/ directory
(agent); anything else stops without running a validator. Steps 1-3 live in
references/skill-flow.md and references/agent-flow.md, and gotchas that apply to one flow live in
that flow's file, since it is loaded on every invocation anyway. If validate.sh reports on the
other artifact type, the body restarts at Step 0.

Named factory-audit rather than forge-audit because forge is a live skill, and a family prefix that
matches a live sibling reads as ownership rather than membership.

The description carries one arrow per boundary target, because ADR-0020 resolves only the first
target after an arrow. It drops the quoted "audit this skill"-style phrases, which restated
"audited" in a second register (ADR-0020's duplicate-register rule). 241 characters, Gotchas 16%
of the body: no size SUGGESTIONs.

The boundary resolver stays embedded in two files rather than imported: a cache-installed plugin
cannot read outside its own directory, and the repo-root hook resolves via .pre-commit-hooks.yaml
where entry[0] is the only token pre-commit rewrites, so no single file is reachable by both.
tests/test-adr0020-contract.sh hashes both copies for byte-identity, and asserts validate.sh sources
the resolver and that no third copy exists.

The entry scripts classify the target from its resolved parent directory, so a bare agent filename
typed inside agents/ works; resolve SCRIPT_DIR CDPATH-safely; and exit 2 when a lib-*.sh is
missing, rather than dying with exit 1, the tier the flows relay as real findings.

The provenance run functions stash their findings code in KYBERFORGE_PROV_RC and
return 0, so validate-provenance.sh calls them UNTESTED. Testing a function's
status (`f || RC=$?`) disables errexit for its entire body, and no subshell or
`set -e` inside can re-arm it once the call sits in a condition context
(measured, both spellings). Their error paths use `exit`, which is unaffected
either way; this keeps errexit armed for anything added later.

Case 0's readability guard reads the file instead of asking `[[ -r ]]`. `-r` is
access(2), which answers yes for uid 0 even on a mode-000 file, and this repo's
dev environment is root -- so the guard could never fire where it exists to fire.
A read attempt is also the stricter question, catching EIO. This is the reasoning
scripts/check-vale-style-sync.sh carried before this commit deleted it; the
hazard did not go with it.

All three entry scripts are CDPATH-safe, vale-wrap.sh included: both of its cd sites are cleared,
the --config resolution and the directory-mirror walk, where an exported CDPATH would otherwise
print a decoy path into the -print0 stream and build the mirror from the decoy's files. The two
remaining bare cd calls take absolute paths, which CDPATH is never consulted for.

Impact

BREAKING: skill-audit and agent-audit no longer exist as invocable skills. kyberforge goes to
2.0.0 (catalog 0.4.7).

Check logic is unchanged: differential runs of the old and new validators across every skill and
agent produced byte-identical stdout, stderr and exit codes, and the reconstructed Python payloads
differ only in comments and the references/field-inventory.md -> agent-field-inventory.md rename.
One doctrine governs the tiers: exit 0 is audited and clean, exit 1 is audited with findings OR a
target present but unreadable, exit 2 is that nothing was audited at all. Edge paths DID change,
deliberately (full table in ADR-0025):
- a missing target exits 2 (never ran), not 1, under its own "does not exist" message; detection is
  by path shape, so a shape-matching path that is simply absent used to reach the validator and come
  back as a FAIL against a file that never existed;
- an unshaped target exits 2 under the generic "matches neither" message, and a directory with no
  SKILL.md under a third, distinct one -- three exit-2 messages, not one;
- a dangling symlink or a symlink loop stays exit 1: it is present but broken, which is a finding
  about the artifact rather than a usage error;
- a SKILL.md file path is audited as its skill directory instead of refused;
- a .md agent outside an agents/ directory is refused rather than audited;
- a missing script library, a missing python3, a missing PyYAML, and no argument at all each exit 2.
  validate-provenance.sh already exited 2 for the last two; validate.sh now matches it.

.pre-commit-hooks.yaml is a published contract consumed by external repos. Both hook IDs and both
files: regexes are unchanged; only entry: and description: moved.

scripts/check-vale-style-sync.sh (413), scripts/sync-vale-styles.sh (21),
tests/test-check-vale-style-sync.sh (797) and agent-audit/scripts/README.md (47) are deleted. The
checker made 17 assertions: 6 compared the two Vale copies and are moot; 10 are rehomed into
tests/test-vale-wrap.sh (case 0, cases 28-31, and the suite's Vale-absent skip); and the
cross-manifest files: agreement check, which selected hooks by entry: and so could not survive both
hooks sharing one, is ported as case 33 pairing hooks by id:. Cases 28, 30 and 33 carry mutation
self-tests; narrowing the local skill prefilter to 6 of 38 SKILL.md files now fails the suite.

Skills go 39 to 38. Pre-push goes 9 repo-authored hooks to 8.

ADR: 0025
BREAKING-CHANGE: the skill-audit and agent-audit skills are removed. Both flows are served by
  factory-audit, which auto-detects whether it was handed a skill directory or an agent file.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YR2CjVumUbEGWcMikcoXBD

plugins/kyberforge/.apm/skills/factory-audit/SKILL.md

@@ -0,0 +1,77 @@
+---
+name: factory-audit
+description: >
+  Use when the user wants a skill directory or agent definition audited,
+  including "is this ready to ship", or after hand-editing one outside its
+  author skill. Not applying skill fixes -> skill-author. Not applying agent
+  fixes -> agent-author.
+allowed-tools: Bash Read
+metadata:
+  version: "1.0.1"
+  category: factory
+  source_keys:
+    - agentskills-home
+    - agentskills-spec
+    - agentskills-best-practices
+    - agentskills-optimizing-descriptions
+    - agentskills-using-scripts
+    - context7-websites-code-claude
+    - claude-code-plugins-docs
+    - claude-code-subagents-docs
+    - context7-github-en-copilot
+    - github-custom-agents-configuration
+---
+
+## Gotchas
+
+- Do not narrate PASS/FAIL per check while auditing. Gather findings internally and surface them only in the Step 4 report. Narrating each check as you go is the default failure mode here.
+- A file carrying `disable-model-invocation: true` is hand-invoked — its description is never routed against, so the trigger, capability and boundary rules do not apply. Audit it as one plain human-facing sentence instead.
+- Vale reporting `0 files` scanned means NOT RUN, not clean. Fall back to full Step 3 judgment for every dimension it would have covered.
+
+## Step 0 — Dispatch
+
+Resolve the flow from the target path **before running anything**. The two flows run different validators over different dimension vocabularies, so dispatching after Step 1 means the wrong validator has already produced the wrong findings. The rows mirror the shapes `scripts/validate.sh` accepts; take the first that matches.
+
+| Target | Flow | Read |
+|---|---|---|
+| A directory containing `SKILL.md` | skill | `references/skill-flow.md` |
+| A file named `SKILL.md` — audit its parent directory | skill | `references/skill-flow.md` |
+| A file named `*.agent.md` | agent | `references/agent-flow.md` |
+| A `.md` file whose immediate parent directory is `agents/` (`.apm/agents`, `.claude/agents`, `.github/agents`, `.copilot/agents`) | agent | `references/agent-flow.md` |
+| Anything else — a missing path, a directory without `SKILL.md`, any other file | none | — |
+
+Read only the file its row matched. Each carries Steps 1 to 3 — the deterministic checks, the read, and the qualitative audit — and is self-contained. Return here for Step 4.
+
+On the last row, stop: run no validator and tell the user the two accepted shapes — a skill directory (or its `SKILL.md`), or an agent file (`*.agent.md`, or a `.md` directly under an `agents/` directory). Guessing a flow audits the path against the wrong spec.
+
+The scripts re-detect the flow from the path. If `validate.sh` reports on the other artifact type than your row, discard what you have and restart here — the flow file, not the script, picked your rubrics, coverage line and remediation line.
+
+## Step 4 — Report
+
+Open with the coverage line for the flow you took, naming every dimension checked.
+
+Skill flow:
+
+```text
+Checked: structure · description · body-discipline · patterns · file-structure · formatting · scripts · internal-consistency · provenance
+```
+
+Agent flow:
+
+```text
+Checked: structure · provider-safety · description · body · delegation · comment-discipline · pair-consistency · provenance
+```
+
+On the agent flow at plugin/APM scope, drop `pair-consistency` — there is no pair to check.
+
+Then output only the dimensions that have findings, grouped under H3 headings, FAILs before SUGGESTIONs within each. Omit clean dimensions — their absence is what confirms they passed.
+
+Each finding:
+
+```text
+FAIL/SUGGESTION  <finding> — file:line
+                 Why: <why this is a problem>
+                 Fix: <exact change — quote before/after where applicable>
+```
+
+Close with a `## Result` block holding one line: `PASS`, `PASS (N suggestions)`, or `FAIL (N fails · M suggestions)`, each optionally followed by ` · P info`. INFO findings are observational and never change PASS/FAIL; omit `· P info` when there are none. Add a second line whenever there is at least one finding — `Run skill-author to address findings.` on the skill flow, `Run agent-author to address findings.` on the agent flow. Do not apply fixes — report and propose only.