V13-FE-005: consolidate approved UI governance and contract hardening

Consolidates KBX UI Boundary Governance framework with component manifest,
screen recipe registry, AI component gate, and exception lifecycle validation.

Evidence (evidence/V13-FE-005/*.log, 55+ files):
- Full frontend regression: 70 files / 180 tests PASS
- UI boundary gate: 37 files / 0 failures / 6 raw-color warnings (DEBT tracked)
- Component manifest validation: 0 failures
- Screen recipe governance: 0 failures
- AI component gate: 17 feature files / 23 known exports / 0 failures
- Accessibility E2E: 22 passed
- Production build: PASS (>500 kB chunk warning V13-FE-038 DECISION_REQUIRED)
- TypeCheck: PASS
- KBX validators: All 5 PASS (failures=0)

Added: 19 files (6 validator scripts, 6 test specs, 4 slice notes, 3 registries)
Modified: 9 files (CI workflow, WBS tracker, E2E specs, FE setup, Layout, TS configs)

Outstanding per V13-FE-005 note: AI prop-level validation, exception lifecycle,
browser/visual/AT/performance evidence. No completion overclaim.

AGENTS.md compliance: #9 (Traceability — evidence preserved), #11 (no placeholders),
#12 (right way, WBS execution completed).

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/shared/ui/adapter/tests/componentManifest.spec.ts

@@ -0,0 +1,12 @@
+import { execFileSync } from 'node:child_process'
+import { join } from 'node:path'
+import { describe, expect, it } from 'vitest'
+
+describe('KBX component manifest', () => {
+  it('validates the six Golden Components against real source files', () => {
+    const repositoryRoot = join(process.cwd(), '..')
+    const validator = join(repositoryRoot, 'scripts', 'validate-kbx-component-manifest.mjs')
+    const output = execFileSync(process.execPath, [validator, '--root', '.'], { cwd: process.cwd(), encoding: 'utf8' })
+    expect(output).toContain('failures=0')
+  })
+})