refactor: simplify tests folder structure

- Flatten tests/integration/ipc/ to tests/ipc/
- Move tests/models/knownModels.test.ts to src/common/constants/ (colocate with implementation)
- Delete orphan tests/worker-test.test.ts
- Update CI to run tests/ipc + tests/runtime (fixes runtime tests not running)
- Update paths-filter backend filter for new structure

Tests philosophy: unit tests colocated in src/, integration tests in tests/

Author: ammar-agent

.github/workflows/pr.yml

@@ -51,7 +51,8 @@ jobs:
               - 'src/cli/**'
               - 'src/desktop/**'
               - 'src/common/**'
-              - 'tests/integration/**'
+              - 'tests/ipc/**'
+              - 'tests/runtime/**'
             config:
               - '.github/**'
               - 'jest.config.cjs'
@@ -122,7 +123,7 @@ jobs:
           fetch-depth: 0
       - uses: ./.github/actions/setup-mux
       - run: make build-main
-      - run: TEST_INTEGRATION=1 bun x jest --coverage --maxWorkers=100% --silent ${{ github.event.inputs.test_filter || 'tests' }}
+      - run: TEST_INTEGRATION=1 bun x jest --coverage --maxWorkers=100% --silent ${{ github.event.inputs.test_filter || 'tests/ipc tests/runtime' }}
         env:
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

docs/system-prompt.md

@@ -62,5 +62,4 @@ You are in a git worktree at ${workspacePath}
 }
 ```
 
-
 {/* END SYSTEM_PROMPT_DOCS */}

tests/models/knownModels.test.ts src/common/constants/knownModels.test.tstests/models/knownModels.test.ts renamed to src/common/constants/knownModels.test.ts

@@ -41,7 +41,7 @@ describe("Known Models Integration", () => {
       const lookupKey = model.provider === "xai" ? `xai/${modelId}` : modelId;
       const modelData =
         (modelsJson[lookupKey as keyof typeof modelsJson] as Record<string, unknown>) ??
-        (modelsExtra[modelId as keyof typeof modelsExtra] as unknown as Record<string, unknown>);
+        (modelsExtra[modelId] as Record<string, unknown>);
 
       expect(modelData).toBeDefined();
       // Check that basic metadata fields exist (not all models have all fields)