Add embedding config default regression tests

---
Build: pass | Tests: pass — 2451 passed (182 files)

src/config-identity.test.ts

@@ -18,6 +18,10 @@ const ENV_KEYS = [
   'OPENROUTER_API_KEY',
   'DEEPSEEK_API_KEY',
   'OPENAI_API_KEY',
+  'EMBED_BASE_URL',
+  'EMBED_API_KEY',
+  'EMBED_MODEL',
+  'EMBED_DIMENSIONS',
 ] as const;
 
 function resetIdentityEnv(): void {
@@ -168,4 +172,43 @@ describe('config identity', () => {
     });
     expect(config.resolveProviderApiKey('unknown')).toBeNull();
   });
+
+  it('falls back to local embeddings when the env file omits EMBED_BASE_URL', async () => {
+    vi.doMock('./env.js', async () => {
+      const actual =
+        await vi.importActual<typeof import('./env.js')>('./env.js');
+      return {
+        ...actual,
+        readEnvFile: () => ({}),
+      };
+    });
+
+    const config = await import('./config.js');
+
+    expect(config.EMBED_BASE_URL).toBe('http://localhost:8080/v1');
+    expect(config.EMBED_MODEL).toBe('BAAI/bge-m3');
+    expect(config.EMBED_API_KEY).toBe('');
+
+    vi.doUnmock('./env.js');
+  });
+
+  it('derives OpenRouter embedding settings from an env-file OpenRouter key', async () => {
+    vi.doMock('./env.js', async () => {
+      const actual =
+        await vi.importActual<typeof import('./env.js')>('./env.js');
+      return {
+        ...actual,
+        readEnvFile: () => ({ OPENROUTER_API_KEY: 'or-key' }),
+      };
+    });
+
+    const config = await import('./config.js');
+
+    expect(config.OPENROUTER_API_KEY).toBe('or-key');
+    expect(config.EMBED_BASE_URL).toBe('https://openrouter.ai/api/v1');
+    expect(config.EMBED_MODEL).toBe('BAAI/bge-m3');
+    expect(config.EMBED_API_KEY).toBe('or-key');
+
+    vi.doUnmock('./env.js');
+  });
 });