feat(ai): AI-primary due_date flow — rule as prompt candidates only

Flow 반전 (F7-D 채택):
- 기존: rule.iso ?? ai.dueDate (rule 우선)
- 신규: ai.dueDate ?? null (AI 우선)

규칙은 parseAllCandidates 로 모든 매치를 추출 → prompt 에 후보
힌트로 주입. AI 가 종합 판단. AI 실패 시 due_date null (별 fallback 없음).

해결되는 케이스: '내일 모레' → AI 가 ambiguous 인지 → null.

PROMPT_VERSION → 3. GenerateInput.dueDateCandidates 신규.
buildPrompt(rawText, todayKst, candidates) — 빈 배열일 때 hint 섹션 생략.

Tests:
- AiWorker.test.ts — 'rule priority' 테스트 → 'AI dueDate wins' flip
- AiWorker.test.ts — passes todayKst 테스트 확장 (dueDateCandidates 도 검증)
- AiWorker.test.ts — 신규 'passes parseAllCandidates result as dueDateCandidates'
- LocalOllamaProvider.test.ts / ollama-golden.test.ts — generate 호출에 dueDateCandidates: [] 추가

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/integration/ollama-golden.test.ts

@@ -20,7 +20,7 @@ describe.skipIf(skip)('LocalOllamaProvider integration', () => {
   ];
 
   it.each(cases)('Korean title + 3 lines for: %s', async (input) => {
-    const r = await provider.generate({ text: input, todayKst: '2026-04-26' });
+    const r = await provider.generate({ text: input, todayKst: '2026-04-26', dueDateCandidates: [] });
     expect(/[가-힣]/.test(r.title)).toBe(true);
     expect(r.summary.split('\n')).toHaveLength(3);
     for (const t of r.tags) expect(t).toMatch(/^[a-z0-9]+(-[a-z0-9]+)*$/);

tests/unit/AiWorker.test.ts

@@ -82,14 +82,14 @@ describe('AiWorker', () => {
     expect(max).toBe(1);
   });
 
-  it('rule parser match takes priority over AI dueDate', async () => {
+  it('AI dueDate wins over rule candidates (flow reversed from F1)', async () => {
     const provider = {
       name: 'mock',
-      generate: async (_input: any) => ({
+      generate: async () => ({
         title: '내일',
         summary: 'a\nb\nc',
         tags: [],
-        dueDate: '2026-12-31' // AI returns far-future
+        dueDate: '2026-12-31'  // AI says far future, rule has '내일'
       }),
       healthCheck: async () => ({ ok: true })
     } as any;
@@ -101,7 +101,7 @@ describe('AiWorker', () => {
     await w.enqueue(id);
     await w.drain();
     const note = repo.findById(id)!;
-    expect(note.dueDate).toBe('2026-04-27'); // 내일 from rule, not AI's 12-31
+    expect(note.dueDate).toBe('2026-12-31'); // AI value, not rule
   });
 
   it('rule null + AI value → AI used', async () => {
@@ -154,6 +154,7 @@ describe('AiWorker', () => {
       name: 'mock',
       generate: async (input: any) => {
         seen.todayKst = input.todayKst;
+        seen.dueDateCandidates = input.dueDateCandidates;
         return { title: '메모', summary: 'a\nb\nc', tags: [], dueDate: null };
       },
       healthCheck: async () => ({ ok: true })
@@ -166,5 +167,29 @@ describe('AiWorker', () => {
     await w.enqueue(id);
     await w.drain();
     expect(seen.todayKst).toBe('2026-04-27');
+    expect(Array.isArray(seen.dueDateCandidates)).toBe(true);
+    expect(seen.dueDateCandidates.length).toBe(0);
+  });
+
+  it('passes parseAllCandidates result to provider.generate as dueDateCandidates', async () => {
+    let captured: any = null;
+    const provider = {
+      name: 'mock',
+      generate: async (input: any) => {
+        captured = input;
+        return { title: '내일', summary: 'a\nb\nc', tags: [], dueDate: null };
+      },
+      healthCheck: async () => ({ ok: true })
+    } as any;
+    const w = new AiWorker(repo, provider, {
+      backoffsMs: [0],
+      now: () => new Date('2026-04-26T00:00:00.000Z')
+    });
+    const { id } = repo.create({ rawText: '내일 모레 회의' });
+    await w.enqueue(id);
+    await w.drain();
+    expect(captured.dueDateCandidates).toBeDefined();
+    expect(Array.isArray(captured.dueDateCandidates)).toBe(true);
+    expect(captured.dueDateCandidates.length).toBe(2); // 내일 + 모레
   });
 });

tests/unit/LocalOllamaProvider.test.ts

@@ -22,7 +22,7 @@ describe('LocalOllamaProvider', () => {
     mock.get('http://localhost:11434').intercept({ path: '/api/generate', method: 'POST' }).reply(200, {
       response: JSON.stringify({ title: '회의', summary: '첫\n둘\n셋', tags: ['api'] })
     });
-    const r = await new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26' });
+    const r = await new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] });
     expect(r.title).toBe('회의');
   });
 
@@ -31,7 +31,7 @@ describe('LocalOllamaProvider', () => {
       response: 'not json'
     });
     await expect(
-      new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26' })
+      new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] })
     ).rejects.toThrow(/json/i);
   });
 
@@ -41,7 +41,7 @@ describe('LocalOllamaProvider', () => {
       return { statusCode: 200, data: '{}' };
     }) as never);
     await expect(
-      new LocalOllamaProvider({ timeoutMs: 50 }).generate({ text: 'x', todayKst: '2026-04-26' })
+      new LocalOllamaProvider({ timeoutMs: 50 }).generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] })
     ).rejects.toThrow();
   }, 2000);