feat(ai): LocalOllamaProvider with 120s timeout + integration harness

Task 12 of the slice plan. Implements the slice's only provider:
- generate(): POST {endpoint}/api/generate with Korean-first
  prompt; AbortController-driven 120s timeout; parses
  body.response as JSON and runs it through parseAiResponse.
- healthCheck(): GET /api/tags; returns ok when configured model
  is in the listing, otherwise reports the missing-model reason.
- Constructor takes opts.endpoint / opts.model so Task 30 main
  entry can inject INKLING_OLLAMA_ENDPOINT for LAN dogfood;
  defaults are http://localhost:11434 and gemma4:e4b.

Tests: 6 unit cases via undici MockAgent (parse, non-JSON,
timeout abort, healthCheck ok / missing / connection error).
Integration test gated by INKLING_INTEGRATION=1 hits real
Ollama for Korean / English-stack / mixed input cases with a
180s per-test budget — also reads INKLING_OLLAMA_ENDPOINT so
LAN dogfood can be exercised end-to-end.

Plan deviation: undici@8 types treat MockAgent's `.reply()`
callback as sync-return-only, so the 500ms-delayed reply used
in the timeout test is cast `as never` to bypass the overload
mismatch. Behavior is correct at runtime; the cast is local to
the test.

Verification: `npx vitest run tests/unit/LocalOllamaProvider.test.ts`
6 passed.

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

tests/integration/ollama-golden.test.ts

@@ -0,0 +1,28 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import { LocalOllamaProvider } from '@main/ai/LocalOllamaProvider.js';
+
+const skip = process.env.INKLING_INTEGRATION !== '1';
+
+describe.skipIf(skip)('LocalOllamaProvider integration', () => {
+  const provider = new LocalOllamaProvider({
+    endpoint: process.env.INKLING_OLLAMA_ENDPOINT
+  });
+
+  beforeAll(async () => {
+    const h = await provider.healthCheck();
+    if (!h.ok) throw new Error(`Ollama not ready: ${h.reason}`);
+  });
+
+  const cases = [
+    '회의 중 A프로젝트 API 타임아웃 문제가 재발했다는 보고를 받음.',
+    'Stack trace: java.net.SocketTimeoutException at com.inkling.Api.call ... retried 3 times.',
+    '오늘 점심 김치찌개 맛있었음. 오후에 디자인 미팅 있다.'
+  ];
+
+  it.each(cases)('Korean title + 3 lines for: %s', async (input) => {
+    const r = await provider.generate({ text: input });
+    expect(/[가-힣]/.test(r.title)).toBe(true);
+    expect(r.summary.split('\n')).toHaveLength(3);
+    for (const t of r.tags) expect(t).toMatch(/^[a-z0-9]+(-[a-z0-9]+)*$/);
+  }, 180_000);
+});