feat(ollama): LocalOllamaProvider — abort() + AbortController instance field (v0.2.3.1)

- abortController 가 method-local 에서 private instance field 로 이동
- public abort() 메서드 — 외부에서 in-flight generate 강제 중단
- ProviderHolder.replace() 시 호출되어 endpoint 변경 즉시 반영
- 단위 +2 cases (abort cancellation, model 파라미터)

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

tests/unit/LocalOllamaProvider.test.ts

@@ -89,4 +89,24 @@ describe('LocalOllamaProvider', () => {
     expect(h.ok).toBe(false);
     expect(h.reason).toMatch(/connect|refused|unreachable/i);
   });
+
+  it('abort() cancels in-flight generate (rejects with AbortError)', async () => {
+    mock.get('http://localhost:11434').intercept({
+      path: '/api/generate', method: 'POST'
+    }).reply((async () => {
+      await new Promise<void>((r) => setTimeout(r, 5000)); // long-running
+      return { statusCode: 200, data: '{}' };
+    }) as never);
+    const provider = new LocalOllamaProvider({ timeoutMs: 30_000 });
+    const generatePromise = provider.generate({
+      text: 'x', todayKst: '2026-05-04', dueDateCandidates: []
+    });
+    setTimeout(() => provider.abort(), 50);
+    await expect(generatePromise).rejects.toThrow();
+  });
+
+  it('constructor uses provided model param (not just default)', () => {
+    const provider = new LocalOllamaProvider({ model: 'gemma4:26b' });
+    expect(provider.name).toBe('local-ollama/gemma4:26b');
+  });
 });