[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/features/annotations/AnnotationsPage.tsx

@@ -7,7 +7,7 @@ import CanvasEditor, { type CanvasEditorHandle } from './CanvasEditor'
 import AnnotationsSidebar from './AnnotationsSidebar'
 import { DetectionClasses } from '../../components'
 import { AnnotationSource, AnnotationStatus, MediaType } from '../../types'
-import { getClassColor, getClassNameFallback, getPhotoModeSuffix } from './classColors'
+import { getClassColor, getClassNameFallback, getPhotoModeSuffix } from '../../class-colors'
 import type { Media, AnnotationListItem, Detection } from '../../types'
 
 export default function AnnotationsPage() {

src/features/annotations/AnnotationsSidebar.tsx

@@ -2,7 +2,7 @@ import { useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import { FaDownload } from 'react-icons/fa'
 import { api, createSSE, endpoints } from '../../api'
-import { getClassColor } from './classColors'
+import { getClassColor } from '../../class-colors'
 import type { Media, AnnotationListItem, PaginatedResponse } from '../../types'
 
 interface Props {

src/features/annotations/CanvasEditor.tsx

@@ -2,7 +2,7 @@ import { useRef, useEffect, useState, useCallback, forwardRef, useImperativeHand
 import { endpoints } from '../../api'
 import { MediaType } from '../../types'
 import type { Media, AnnotationListItem, Detection, Affiliation, CombatReadiness } from '../../types'
-import { getClassColor, getPhotoModeSuffix, getClassNameFallback } from './classColors'
+import { getClassColor, getPhotoModeSuffix, getClassNameFallback } from '../../class-colors'
 
 interface Props {
   media: Media

src/features/annotations/classColors.ts

@@ -1,24 +0,0 @@
-const CLASS_COLORS = [
-  '#FF0000', '#00FF00', '#0000FF', '#FFFF00', '#FF00FF', '#00FFFF',
-  '#800000', '#008000', '#000080', '#808000', '#800080', '#008080',
-]
-
-export const FALLBACK_CLASS_NAMES = [
-  'Car', 'Person', 'Truck', 'Bicycle', 'Motorcycle', 'Bus',
-  'Animal', 'Tree', 'Building', 'Sign', 'Boat', 'Plane',
-]
-
-export function getClassColor(classNum: number): string {
-  const base = classNum % 20
-  return CLASS_COLORS[base % CLASS_COLORS.length]
-}
-
-export function getPhotoModeSuffix(classNum: number): string {
-  const mode = Math.floor(classNum / 20)
-  return mode === 1 ? ' (winter)' : mode === 2 ? ' (night)' : ''
-}
-
-export function getClassNameFallback(classNum: number): string {
-  const base = classNum % 20
-  return FALLBACK_CLASS_NAMES[base % FALLBACK_CLASS_NAMES.length] ?? `#${classNum}`
-}

src/features/annotations/index.ts

@@ -2,11 +2,3 @@ export { default as AnnotationsPage } from './AnnotationsPage'
 // CanvasEditor remains in the Public API while F2 (cross-feature edge to
 // 07_dataset) is open. Closing F2 will remove this re-export.
 export { default as CanvasEditor } from './CanvasEditor'
-//
-// classColors symbols are NOT re-exported here. The file is logically owned
-// by 11_class-colors but lives under this directory until F3 moves it. Re-
-// exporting through this barrel creates a circular dependency
-//   AnnotationsPage -> DetectionClasses -> 06_annotations barrel -> AnnotationsPage
-// because DetectionClasses (03_shared-ui) imports classColors. Consumers
-// import classColors directly via `src/features/annotations/classColors`
-// as a documented F3-pending exemption. STC-ARCH-01 carries the exemption.