feat(ingest): T0.5–T5 純餵食器管線實作（issue #2）

ingest 全管線（採取優先、extract fallback、跨庫織網、POST envelope）：
- T0.5 骨架：Hono + zod-openapi，無 D1/Vectorize/AI 綁定（不碰儲存鐵律）
- T1 SourceAdapter：GitHub runtime API 拉 + per-file sha256 content-hash + /refresh 受理端
- T2 採取（路徑 A 優先）：harvest template 1.8.0+ 卡（gloss/實體/typed-edge）
- T3 extract（路徑 B fallback）：LlmCaller 可選模型 + JSON-fail 升級閘 + 端點對齊硬自檢護欄；第一版不 embed（只打標）
- T4 跨庫織網（主職）：匯總多 repo → 偵測跨庫橋/異見，不算 bridge_score（graph 領域）
- T5 輸出：buildEnvelope strict + 顯式禁送欄位自檢；graph-client 純 POST（cherry-pick _kbdb_client.py 改不碰 base）；薄 ops CLI（不帶查詢 MCP）

envelope 對齊 full contract（embed/id/aliases/predicate_embed）；同步 contract 向量化欄位升格。

gate：vitest 28 passed / tsc clean / wrangler dry-run 乾淨（只 env-var 綁定）。
端到端 ingest→graph：graph receiver 已補對齊 → 待 ingest 部署 + GRAPH_BASE_URL → 待部署驗，未假綠。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/source-pipeline.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect } from 'vitest';
+import { makeSourceUri, parseSourceUri, contentHash, pullRepoMarkdown, type GitHubFetcher } from '../src/lib/source-adapter';
+import { processSource } from '../src/lib/pipeline';
+import type { LlmCaller } from '../src/lib/extract';
+
+describe('source-adapter uri', () => {
+  it('makeSourceUri / parseSourceUri round-trip', () => {
+    const uri = makeSourceUri('uncle6me-web', 'kbdb-ingest-plugin', 'system-dev/wiki/cards/ingest/掛載架構.md');
+    expect(uri).toBe('github:uncle6me-web/kbdb-ingest-plugin@system-dev/wiki/cards/ingest/掛載架構.md');
+    expect(parseSourceUri(uri)).toEqual({
+      owner: 'uncle6me-web',
+      repo: 'kbdb-ingest-plugin',
+      path: 'system-dev/wiki/cards/ingest/掛載架構.md',
+    });
+  });
+
+  it('content-hash 穩定且隨內容變', async () => {
+    const a = await contentHash('hello');
+    expect(a).toBe(await contentHash('hello'));
+    expect(a).not.toBe(await contentHash('world'));
+  });
+});
+
+const HARVEST_CARD = `---
+gloss: 卡標題定義。
+---
+# 卡A
+## 實體
+- **甲** — 甲的定義。
+- **乙** — 乙的定義。
+## 關聯
+- 甲 >> 連到 >> 乙
+`;
+
+function mockFetcher(files: Record<string, string>): GitHubFetcher {
+  return {
+    async listMarkdown() {
+      return Object.keys(files);
+    },
+    async getFile(_o, _r, path) {
+      return { text: files[path], commit: 'sha1' };
+    },
+  };
+}
+
+describe('pullRepoMarkdown + processSource', () => {
+  it('採取路徑 A：拉檔 → harvest → envelope（不 extract）', async () => {
+    const sources = await pullRepoMarkdown(mockFetcher({ 'cards/a.md': HARVEST_CARD }), 'o', 'r');
+    expect(sources.length).toBe(1);
+    const result = await processSource(sources[0]);
+    expect(result.path).toBe('harvest');
+    expect(result.envelope?.triplets).toEqual([{ subject: '甲', predicate: '連到', object: '乙', predicate_embed: true }]);
+    expect(result.envelope?.extractor.model).toBe('local-harvest');
+  });
+
+  it('採不到三元組 + 無萃取模型 → skipped（不假萃）', async () => {
+    const sources = await pullRepoMarkdown(mockFetcher({ 'plain.md': '# 純文字\n沒有三元組。' }), 'o', 'r');
+    const result = await processSource(sources[0]);
+    expect(result.path).toBe('skipped');
+    expect(result.envelope).toBeNull();
+  });
+
+  it('採不到 → fallback extract（路徑 B）', async () => {
+    const caller: LlmCaller = {
+      model: 'haiku',
+      call: async () => JSON.stringify({ nodes: [{ name: '甲' }], triplets: [{ subject: '甲', predicate: '是', object: '乙' }] }),
+    };
+    const sources = await pullRepoMarkdown(mockFetcher({ 'plain.md': '# 純文字\n甲是乙。' }), 'o', 'r');
+    const result = await processSource(sources[0], { shallowCaller: caller });
+    expect(result.path).toBe('extract');
+    expect(result.envelope?.extractor.model).toBe('haiku');
+  });
+});