Add E2E tests for MCP Tool Execution and Session Lifecycle

- Implement comprehensive end-to-end tests for MCP Tool Execution, covering tool discovery, execution, parameter validation, error handling, and timeout scenarios.
- Introduce tests for the complete lifecycle of a workflow session, including initialization, task management, status updates, and archiving.
- Validate dual parameter format support and handle boundary conditions such as invalid JSON, non-existent sessions, and path traversal attempts.
- Ensure concurrent task updates are handled without data loss and that task data is preserved when archiving sessions.
- List sessions across all locations and verify metadata inclusion in the results.

package.json

@@ -13,6 +13,7 @@
     "start": "node ccw/bin/ccw.js",
     "test": "node --experimental-strip-types --test ccw/tests/*.test.js",
     "test:visual": "node --experimental-strip-types --test ccw/tests/visual/**/*.visual.test.ts",
+    "test:e2e": "node --experimental-strip-types --test ccw/tests/e2e/*.e2e.test.ts",
     "prepublishOnly": "npm run build && echo 'Ready to publish @dyw/claude-code-workflow'"
   },
   "keywords": [