feat(opt): optimization lens Chunk 2b — opus prose-judgment analyzer + /config-audit optimize

The recall+precision halves of the CA-OPT hybrid motor for the three
mechanism-fit cases the deterministic OPT scanner (2a) deliberately skips:
lifecycle→hook (BP-MECH-001), unscoped path-specific→rule (BP-MECH-002),
absolute "never"→permission (BP-MECH-004).

New:
- scanners/lib/lens-prefilter.mjs — cheap, recall-oriented line scan of the
  CLAUDE.md body; detector names mirror the register lensCheck fields; skips
  fenced code, gates the path class on an instruction verb. Pure + 13 tests.
- scanners/optimize-lens-cli.mjs — discovery + OPT scanner + pre-filter; attaches
  only the CONFIRMED register entry to each candidate (unverifiable → dropped,
  Verifiseringsplikt); emits {deterministic, candidates, register, counts}.
- agents/optimization-lens-agent.md — opus precision gate (7th agent, orange):
  reads the real CLAUDE.md, drops low-confidence candidates, keeps only genuine
  opportunities, cites register id + source.
- commands/optimize.md — /config-audit optimize orchestrates pre-filter→agent→report.

Agent-driven → deliberately NOT byte-stable (own command, outside the snapshot
suite). No new orchestrated scanner → scanner count stays 15. Counts: agents
6→7, commands 18→19, suite 1055→1068. Self-audit A/A unchanged, readmeCheck
passed (clean HOME). Plan: docs/v5.7-optimization-lens-plan.md.

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

commands/config-audit.md

@@ -1,7 +1,7 @@
 ---
 name: config-audit
 description: Claude Code Configuration Intelligence - audit, analyze, and optimize your configuration
-argument-hint: "[posture|tokens|manifest|feature-gap|fix|rollback|plan|implement|help|discover|analyze|interview|drift|plugin-health|whats-active|status|cleanup]"
+argument-hint: "[posture|tokens|manifest|feature-gap|optimize|fix|rollback|plan|implement|help|discover|analyze|interview|drift|plugin-health|whats-active|status|cleanup]"
 allowed-tools: Read, Write, Glob, Grep, Bash, Agent, AskUserQuestion
 model: opus
 ---
@@ -17,6 +17,7 @@ If a subcommand is provided, route to it:
 - `tokens` → `/config-audit:tokens`
 - `manifest` → `/config-audit:manifest`
 - `feature-gap` → `/config-audit:feature-gap`
+- `optimize` → `/config-audit:optimize`
 - `fix` → `/config-audit:fix`
 - `rollback` → `/config-audit:rollback`
 - `plan` → `/config-audit:plan`