refactor: enhance CI/CD workflows and apply CodeRabbit suggestions

- Convert GitHub Actions from local to inline actions for better maintainability
- Add comprehensive caching for npm dependencies, tree-sitter CLI, and build artifacts
- Fix checkout steps missing in test matrix jobs
- Apply defensive programming in test coverage validation
- Use local tree-sitter CLI via npx instead of global installation
- Update tree-sitter-cli to v0.25.0 for compatibility with tree-sitter-bash
- Add proper tree-sitter field to package.json with grammar metadata
- Fix grammar precedence for Data blocks (#| lines now have higher precedence)
- Standardize dates in memory files to September 12, 2025
- Enhance workflow robustness with dynamic workflow ID resolution
- Improve test file pattern matching and error handling

This commit addresses all CodeRabbit review suggestions and optimizes
GitHub Actions workflows for better performance and reliability.

.serena/memories/project_status_verified_2025.md

@@ -2,7 +2,7 @@
 
 ## Current Status: PRODUCTION READY ✅
 
-This memory contains only verified, accurate information about the current project state as of September 2025.
+This memory contains only verified, accurate information about the current project state as of September 12, 2025.
 
 ## Core Project Facts
 
@@ -242,5 +242,5 @@ With 61/61 tests passing, zero grammar warnings, optimized CI/CD workflows,
 and comprehensive tooling, it represents a high-quality open source project
 ready for immediate use in development workflows and editor integrations.
 
-**Last Verified**: December 2025
+**Last Verified**: September 12, 2025
 **Status**: All claims in this memory have been verified against the actual project state.