fix(v032): NoteRepository.create now param + time-dep test flake fix

- create(input, now?: Date) signature 추가 (기존 setStatus/updateRawText 패턴 정합)
- NoteRevisions.test.ts 4 testcase v1 capture 시간 명시 주입 (2026-05-09T00:00:00Z)
- upsertFromSync.test.ts 2 testcase v1 capture 시간 명시 주입
- 시스템 시계가 2026-05-10T00:00:00Z 초과 시 DESC ordering 깨지던 회귀 회복

backlog: time-dependent flake (Cut F audit 발견)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/NoteRepository.test.ts

@@ -310,6 +310,24 @@ describe('NoteRepository', () => {
     const job = db.prepare('SELECT * FROM pending_jobs WHERE note_id=?').get(id);
     expect(job).toBeDefined();
   });
+
+  it('create accepts explicit now param', () => {
+    const fixed = new Date('2026-05-09T10:00:00.000Z');
+    const { id } = repo.create({ rawText: 'hello' }, fixed);
+    const note = repo.findById(id)!;
+    expect(note.createdAt).toBe('2026-05-09T10:00:00.000Z');
+    expect(note.updatedAt).toBe('2026-05-09T10:00:00.000Z');
+  });
+
+  it('create defaults now to new Date when omitted', () => {
+    const before = Date.now();
+    const { id } = repo.create({ rawText: 'hello' });
+    const after = Date.now();
+    const note = repo.findById(id)!;
+    const ts = new Date(note.createdAt).getTime();
+    expect(ts).toBeGreaterThanOrEqual(before);
+    expect(ts).toBeLessThanOrEqual(after);
+  });
 });
 
 describe('NoteRepository.trash', () => {