Add component lifecycle + retroactive review plan

- docs/reference/component-lifecycle.md: 10-stage quality gate sequence
  (build → stories → audit/critique/harden → fix → polish → present →
  iterate → normalize → preflight → commit)
- docs/reference/retroactive-review-plan.md: Plan to review 30+ existing
  components using condensed process (~3.5 sessions)
- Updated /build-atom, /build-molecule, /build-organism to include
  internal QA stages automatically
- CLAUDE.md: added lifecycle reference as critical rule #8

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/build-atom/SKILL.md

@@ -19,4 +19,10 @@ Use the component-builder agent to handle this task. The user wants to build the
 6. ALL visual values MUST come from the MUI theme — never hardcode
 7. Write comprehensive Storybook stories covering all states
 8. Verify the component renders in Storybook
-9. Update all memory files when done
+9. **Run internal QA** (stages 3-5 from `docs/reference/component-lifecycle.md`):
+   - Run `/audit` — fix all P0/P1 issues
+   - Run `/critique` (skip for simple utility atoms like Divider)
+   - Run `/harden` (skip for display-only atoms like Typography, Badge)
+   - Run `/polish` — final alignment, spacing, transitions
+10. Present to user with summary and scores
+11. Update all memory files when done