[AZ-511] classColors carve-out to src/class-colors/ (closes F3)

Move src/features/annotations/classColors.ts to its own component directory
src/class-colors/ with a proper barrel; update the 4 consumer imports to go
through the barrel; remove the F3-pending exemption from STC-ARCH-01 and from
the architecture test fixture; clean up the 5 coupled doc/script touchpoints.
Closes baseline finding F3 and retires the 5-coupled-places carry-over surface
logged in LESSONS.md 2026-05-12.

- Add `class-colors` to scripts/check-arch-imports.mjs COMPONENT_DIRS so deep
  imports past the new barrel are caught symmetric to every other component.
- Replace the architecture test "exemption WORKS" fixture with the stronger
  "deep import into class-colors NOW FAILS" assertion (Risk 4 mitigation).
- module-layout.md: Layout Rules + Per-Component Mapping (11_class-colors,
  06_annotations, 03_shared-ui) + Verification Needed #1 + shared/class-colors
  block all updated to reflect the new home.
- 11_class-colors/description.md: Caveats §7 + Module Inventory updated.
- architecture_compliance_baseline.md: F3 marked CLOSED with full pre-resolution
  context preserved (mirrors AZ-485/F4 + AZ-486/F7 pattern); F4 carry-forward
  exemption note retired.
- 04_verification_log.md: open questions #1 + #8 marked RESOLVED.
- Build passes with no circular-import warnings (AC-4); fast suite 231/13
  skipped green (AC-5); static profile green (AC-3 — zero exemptions remain).

Batch report: _docs/03_implementation/batch_14_cycle3_report.md

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/DetectionClasses.tsx

@@ -7,7 +7,7 @@ import { api, endpoints } from '../api'
 // Importing through the 06_annotations barrel would create a cycle
 // (DetectionClasses -> 06_annotations barrel -> AnnotationsPage -> DetectionClasses).
 // STC-ARCH-01 exempts this single path as an F3-pending edge.
-import { getClassColor, FALLBACK_CLASS_NAMES } from '../features/annotations/classColors'
+import { getClassColor, FALLBACK_CLASS_NAMES } from '../class-colors'
 import type { DetectionClass } from '../types'
 
 interface Props {