feat(watch mode): Add watch mode support with CLI options and enhanced documentation

readme.plan.md

@@ -149,11 +149,13 @@ tap.test('performance test', async (toolsArg) => {
 ## 5. Test Execution Improvements
 
 
-### 5.2 Watch Mode
+### 5.2 Watch Mode ✅ COMPLETED
 - Automatically re-run tests on file changes
-- Intelligent test selection based on changed files
-- Fast feedback loop for development
-- Integration with IDE/editor plugins
+- Debounced file change detection (300ms)
+- Clear console output between runs
+- Shows which files triggered re-runs
+- Graceful exit with Ctrl+C
+- `--watch-ignore` option for excluding patterns
 
 ### 5.3 Advanced Test Filtering (Partial) ⚠️
 ```typescript