fix(vision): repetition loop 대응 + parseJsonLoose graceful fallback

gemma4:26b 가 "기기기기..." repetition loop 에 빠져 num_predict cap 도달 →
JSON truncate → unparseable. 두 가지 fix:

- Ollama body 에 repeat_penalty: 1.15 추가 (token repetition 억제)
- parseJsonLoose fail 시 throw 대신 {} 반환 → schema graceful coerce 가
  placeholder title/summary 채움. raw_text 는 보존 → 사용자 데이터 무손실.
- coerceNullable 가 undefined 도 처리 (빈 객체 케이스).

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

tests/unit/LocalOllamaProvider.test.ts

@@ -45,13 +45,30 @@ describe('LocalOllamaProvider', () => {
     expect(parsed.prompt).toContain('Prefer reusing');
   });
 
-  it('generate throws on non-JSON', async () => {
+  it('v0.3.14 — generate falls back to placeholder when JSON unparseable', async () => {
+    // 이전엔 throw 했지만 schema graceful coerce 추가 후 placeholder 채워서 통과.
+    // truncated / repetition-loop 응답에서 사용자 데이터 (raw_text) 무손실 보존.
     mock.get('http://localhost:11434').intercept({ path: '/api/generate', method: 'POST' }).reply(200, {
       response: 'not json'
     });
-    await expect(
-      new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] })
-    ).rejects.toThrow(/unparseable/i);
+    const r = await new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] });
+    expect(r.title).toBe('(첨부 메모)');
+    expect(r.summary.length).toBeGreaterThan(0);
+  });
+
+  it('v0.3.14 — body 에 repeat_penalty 포함 (repetition loop 방지)', async () => {
+    let capturedBody: string = '';
+    mock.get('http://localhost:11434').intercept({
+      path: '/api/generate', method: 'POST'
+    }).reply((opts) => {
+      capturedBody = opts.body as string;
+      return { statusCode: 200, data: JSON.stringify({
+        response: JSON.stringify({ title: '회의', summary: 'a\nb\nc', tags: [] })
+      }) };
+    });
+    await new LocalOllamaProvider().generate({ text: 'x', todayKst: '2026-04-26', dueDateCandidates: [] });
+    const parsed = JSON.parse(capturedBody) as { options: { repeat_penalty: number } };
+    expect(parsed.options.repeat_penalty).toBe(1.15);
   });
 
   it('v0.3.11 — generate extracts JSON from markdown fence', async () => {