docs(kyberforge): narrow issue #89 scope, migrate CC platform facts to apm-workflow

A grill-me session determined plugin-author/marketplace-author are fully
superseded by the landed apm-install/apm-workflow/apm-orchestrate artifacts
and will be deleted (not adapted) under issue #90, narrowing issue #89 to
skill-author/agent-author only; forge stays untouched. ADR-0015 is amended
to record this correction plus a three-way content-migration audit.

Claude Code platform-constraint facts that lived only in
plugin-author/marketplace-author (reserved name prefixes, the ADR-0010
agents/ stray-.md validator gotcha, claude plugin validate as a terminal
check, and a removal/re-pack confirm-before-proceeding note) remain true
post-conversion and are migrated into apm-workflow's reference docs via
kyberforge:skill-author, which also updated the skill's README and
sources.md provenance records. Dual-manifest-specific conventions (ADR-0006
parity, CC/Copilot field-placement split) do not carry forward since they
no longer apply.

ADR: 0015

plugins/kyberforge/skills/apm-workflow/references/audit.md

@@ -2,6 +2,8 @@
 topic: audit
 source_keys:
   - context7-microsoft-apm
+  - context7-websites-code-claude
+  - claude-code-plugins-docs
 ---
 
 ## `apm audit`
@@ -47,3 +49,7 @@ jobs:
 ## Frozen installs
 
 `apm install --frozen` fails instead of silently re-resolving if the lockfile is out of date — the CI equivalent of `npm ci` vs `npm install`. Use in any CI job that must not be allowed to drift the lockfile.
+
+## Claude Code validation is a separate terminal check
+
+For packages compiling to the `claude` target, also run `claude plugin validate [--strict]` against the compiled output as a terminal check. `apm audit`/`apm audit --ci` do not check Claude Code-marketplace-specific schema rules (reserved prefixes, the `agents/` stray-file behavior — see `references/compile.md` — etc.), so they don't substitute for it.