feat(opt): optimization lens CA-OPT-001 (procedure→skill) — v5.7 Fase 1 Chunk 2a

First detector of the 'is the config OPTIMAL?' axis (vs the existing 'correct?' scanners). New orchestrated scanner family CA-OPT (count 14->15), the deterministic half of the hybrid optimization lens.

CA-OPT-001 (low, Missed opportunity): a multi-step procedure in CLAUDE.md (>=6 consecutive numbered steps) that belongs in a skill. Reads recommendation + provenance from the best-practices register (BP-MECH-003). Conservative by design; the negative corpus proves null false-positives. Prose-judgment cases (lifecycle->hook, 'never'->permission) are deferred to the Chunk 2b opus analyzer.

Wiring mirrors OST: orchestrator entry, humanizer (OPT->'Missed opportunity' + family), scoring (OPT->'CLAUDE.md', existing area -> no new posture row -> byte-stable), strip-helper (OST,OPT), SC-5 regenerated under hermetic HOME (additive OPT entry only). 10 new tests; suite 1045->1055, self-audit A/A, readmeCheck passed (all verified with a clean HOME).

Note: the pre-existing TOK test reads the real ~/.claude (non-hermetic) -> run the suite with a clean HOME for deterministic results. Tracked as a separate follow-up.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -101,7 +101,7 @@ Default: auto-detects scope from git context. Override with `/config-audit full|
 ```
 
 ### Finding ID Format
-`CA-{SCANNER}-{NNN}` — e.g. `CA-CML-001`, `CA-SET-003`, `CA-HKV-002`, `CA-RUL-005`, `CA-TOK-005`, `CA-CPS-001`, `CA-DIS-001`, `CA-COL-001`, `CA-SKL-001`, `CA-OST-001`
+`CA-{SCANNER}-{NNN}` — e.g. `CA-CML-001`, `CA-SET-003`, `CA-HKV-002`, `CA-RUL-005`, `CA-TOK-005`, `CA-CPS-001`, `CA-DIS-001`, `CA-COL-001`, `CA-SKL-001`, `CA-OST-001`, `CA-OPT-001`
 
 ## Testing
 
@@ -109,7 +109,7 @@ Default: auto-detects scope from git context. Override with `/config-audit full|
 node --test 'tests/**/*.test.mjs'
 ```
 
-1045 tests across 58 test files (18 lib + 30 scanner + 1 hook + 1 agent + 3 commands + 1 knowledge + 4 top-level). Test fixtures in `tests/fixtures/`. Top-level humanizer tests: `json-backcompat.test.mjs`, `raw-backcompat.test.mjs`, `scenario-read-test.test.mjs`, `snapshot-default-output.test.mjs`.
+1055 tests across 59 test files (18 lib + 31 scanner + 1 hook + 1 agent + 3 commands + 1 knowledge + 4 top-level). Test fixtures in `tests/fixtures/`. Top-level humanizer tests: `json-backcompat.test.mjs`, `raw-backcompat.test.mjs`, `scenario-read-test.test.mjs`, `snapshot-default-output.test.mjs`.
 
 ### active-config-reader — load-pattern model + rule/agent/output-style enumeration (v5.6 Foundation)
 
@@ -360,6 +360,18 @@ file in `knowledge/` (the `*.md` stay human-only); source of truth for the v5.7
 JSON, **not** YAML — `yaml-parser.mjs` can't do arrays-of-objects). Byte-stable until a scanner
 consumes it (Chunk 2). Full design: `docs/v5.7-optimization-lens-plan.md`.
 
+### OPT scanner — optimization lens / mechanism-fit (`CA-OPT`, v5.7 Fase 1 Chunk 2a, count 14→15)
+
+First detector of the «optimal?» axis (vs «correct?»). `optimization-lens-scanner.mjs` reads the
+best-practices register and flags config that works but fits a better mechanism. **`CA-OPT-001`**
+(low, *Missed opportunity*): a CLAUDE.md procedure (≥6 consecutive numbered steps) that belongs in a
+skill — recommendation/provenance from register `BP-MECH-003`. Conservative (negative corpus = null
+false-positive); prose-judgment cases (lifecycle→hook, «never»→permission) are deferred to the
+Chunk 2b opus analyzer. Wiring mirrors OST: orchestrator entry, humanizer `OPT:'Missed opportunity'`
++ family, scoring `OPT:'CLAUDE.md'` (existing area → no new posture row → byte-stable), strip-helper
+`OPT`, SC-5 regenerated (additive). **Test-isolation note:** the TOK test reads the real `~/.claude`
+(non-hermetic) — run the suite with a clean `HOME` for deterministic results (pre-existing).
+
 ## Gotchas
 
 - Session directories accumulate — use `/config-audit cleanup` to manage