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/aiComponentGate.spec.ts

@@ -0,0 +1,23 @@
+import { execFileSync } from 'node:child_process'
+import { mkdirSync, mkdtempSync, writeFileSync } from 'node:fs'
+import { join } from 'node:path'
+import { tmpdir } from 'node:os'
+import { describe, expect, it } from 'vitest'
+
+describe('AI component hallucination gate', () => {
+  it('accepts actual feature component usage against the shared export manifest', () => {
+    const validator = join(process.cwd(), '..', 'scripts', 'validate-kbx-ai-components.mjs')
+    const output = execFileSync(process.execPath, [validator, '--root', '.'], { cwd: process.cwd(), encoding: 'utf8' })
+    expect(output).toContain('failures=0')
+  })
+
+  it('rejects an unknown AI-generated component against the same manifest contract', () => {
+    const validator = join(process.cwd(), '..', 'scripts', 'validate-kbx-ai-components.mjs')
+    const root = mkdtempSync(join(tmpdir(), 'kbx-ai-component-'))
+    mkdirSync(join(root, 'src', 'features', 'fixture'), { recursive: true })
+    mkdirSync(join(root, 'src', 'shared', 'ui', 'components'), { recursive: true })
+    writeFileSync(join(root, 'src', 'shared', 'ui', 'components', 'index.ts'), "export { default as KsButton } from './KsButton.vue'\n")
+    writeFileSync(join(root, 'src', 'features', 'fixture', 'Example.vue'), '<template><KbxMagicSearch /></template>')
+    expect(() => execFileSync(process.execPath, [validator, '--root', root], { encoding: 'utf8' })).toThrow()
+  })
+})