fix: broken tests and stale .env.example

- Fix container-runner bug: stopContainer() returns void but was
  passed to exec() as a command string. Replace with direct call
  and try/catch.
- Mock container-runtime in tests so they don't need Docker running.
- Increase claw-skill test timeout to handle slower python startup.
- Clear .env.example (telegram token was added by mistake).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/container-runner.test.ts

@@ -51,6 +51,14 @@ vi.mock('./mount-security.js', () => ({
   validateAdditionalMounts: vi.fn(() => []),
 }));
 
+// Mock container-runtime
+vi.mock('./container-runtime.js', () => ({
+  CONTAINER_RUNTIME_BIN: 'docker',
+  hostGatewayArgs: () => [],
+  readonlyMountArgs: (h: string, c: string) => ['-v', `${h}:${c}:ro`],
+  stopContainer: vi.fn(),
+}));
+
 // Mock OneCLI SDK
 vi.mock('@onecli-sh/sdk', () => ({
   OneCLI: class {