fix(v0211): importNote 가 rebuildFtsTagsForNote 호출 (final review fix)

final code review 발견: F5 import path 가 note_tags INSERT 후 notes_fts.tags 갱신
안 해서 import 한 노트의 tag 가 keyword 검색에서 매칭 안 되는 회귀.

Cut C 의 importNote capture revision 누락 패턴과 동일 — single write path
정책 (Cut D 도입) 의 강제 검사 누락. importNote transaction 끝에서 호출하도록
fix + 회귀 test 2건 (insert path / fork path) 추가.

NoteRepository 안 note_tags INSERT path 는 updateAiResult / updateUserAiFields /
importNote 3곳, 셋 다 rebuildFtsTagsForNote 호출 보장 — invariant 회복.

tests/unit/NoteRepository.test.ts

@@ -1103,4 +1103,57 @@ describe('NoteRepository — notes_fts tags sync (v0.2.11 Cut D)', () => {
       .get(id) as { tags: string };
     expect(row.tags.split(' ').sort()).toEqual(['new1', 'new2']);
   });
+
+  it('importNote insert path: notes_fts.tags 가 csv 로 sync (final review fix)', () => {
+    const repo = new NoteRepository(db);
+    const r = repo.importNote({
+      id: '00000000-0000-0000-0000-000000000010',
+      rawText: 'imported with tags',
+      createdAt: '2026-04-01T00:00:00Z',
+      updatedAt: '2026-04-01T00:00:00Z',
+      aiTitle: 'imported title',
+      aiSummary: 'imported summary',
+      titleEditedByUser: false,
+      summaryEditedByUser: false,
+      aiProvider: 'p',
+      aiGeneratedAt: '2026-04-01T00:00:00Z',
+      userIntent: null,
+      intentPromptedAt: null,
+      tags: [
+        { name: '기획', source: 'ai' },
+        { name: '회의', source: 'user' }
+      ]
+    });
+    expect(r.status).toBe('inserted');
+    const row = db
+      .prepare(`SELECT tags FROM notes_fts WHERE note_id=?`)
+      .get(r.id) as { tags: string };
+    expect(row.tags.split(' ').sort()).toEqual(['기획', '회의']);
+  });
+
+  it('importNote fork path: forked 노트의 notes_fts.tags 동기 (final review fix)', () => {
+    const repo = new NoteRepository(db);
+    const existing = repo.create({ rawText: 'v1' });
+    const r = repo.importNote({
+      id: existing.id,
+      rawText: 'imported v2 with tags',
+      createdAt: '2026-04-01T00:00:00Z',
+      updatedAt: '2026-04-01T00:00:00Z',
+      aiTitle: null,
+      aiSummary: null,
+      titleEditedByUser: false,
+      summaryEditedByUser: false,
+      aiProvider: null,
+      aiGeneratedAt: null,
+      userIntent: null,
+      intentPromptedAt: null,
+      tags: [{ name: '결재', source: 'user' }]
+    });
+    expect(r.status).toBe('forked');
+    expect(r.id).not.toBe(existing.id);
+    const row = db
+      .prepare(`SELECT tags FROM notes_fts WHERE note_id=?`)
+      .get(r.id) as { tags: string };
+    expect(row.tags).toBe('결재');
+  });
 });