docs: correct stale resolver, status and duplication claims

ADR-0014 gains a dated correction: skill-size-check now sources the
boundary resolver from kyberforge (ef27c97), so restoring the external
hook contract needs it made self-contained first. ADR-0017's status
reflects its supersession, architecture.md and gates.md carry the
current duplication counts and reason, gates.md defines vacuous green
inline, and the gitleaks lesson is marked historical.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/adr/0017-plugin-content-mirror-bridges-apm-to-host-discovery.md

@@ -19,7 +19,7 @@ for the parent decision. It resolves the one question ADR-0015's own execution f
 did not block on: whether Claude Code's installer can actually load content out of `.apm/`. It
 could not.
 
-**Status: executed (2026-08-13, issue #90).** `scripts/sync-plugin-content.sh` has been run
+**Status: superseded by ADR-0024** (originally executed 2026-08-13, issue #90; the text below is the record of that execution). `scripts/sync-plugin-content.sh` has been run
 against all 6 plugins; flat `agents/`, `skills/`, `commands/` (etc., wherever `.apm/` populates
 them), and a merged hooks file now exist at each plugin root as tracked, generated files. The
 merged hooks file lands at `hooks/hooks.json`, not at the plugin root itself — see the second