fix: Implement tap.todo(), fix tap.skip.test() to create test objects, and ensure tap.only.test() works correctly

- tap.todo.test() now creates proper test objects marked as todo
- tap.skip.test() creates test objects instead of just logging
- tap.only.test() properly filters to run only marked tests
- Added markAsSkipped() method for pre-test skip marking
- All test types now contribute to accurate test counts
- Updated documentation to reflect these fixes

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

readme.plan.md

@@ -304,14 +304,16 @@ tstest --changed
    - Trend analysis
    - Flaky test detection
 
-### Known Issues to Fix
-- **tap.todo()**: Method exists but has no implementation
-- **tap.skip.test()**: Doesn't create test objects, just logs (breaks test count)
+### Recently Fixed Issues ✅
+- **tap.todo()**: Now fully implemented with test object creation
+- **tap.skip.test()**: Now creates test objects and maintains accurate test count
+- **tap.only.test()**: Works correctly - when .only tests exist, only those run
+
+### Remaining Minor Issues
 - **Protocol Output**: Some protocol messages still appear in console output
-- **Only Tests**: `tap.only.test()` exists but `--only` mode not fully implemented
 
 ### Next Recommended Steps
-1. Add Watch Mode - high developer value
-2. Implement Custom Reporters - important for CI/CD integration
-3. Fix known issues: tap.todo() and tap.skip.test() implementations
-4. Implement performance benchmarking API
+1. Add Watch Mode (Phase 4) - high developer value for fast feedback
+2. Implement Custom Reporters - important for CI/CD integration  
+3. Implement performance benchmarking API
+4. Add better error messages with suggestions