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.

.github/workflows/test.yml

@@ -56,10 +56,6 @@ jobs:
           path: ~/.npm/_npx
           key: ${{ runner.os }}-tree-sitter-cli-${{ hashFiles('package.json') }}
 
-      - name: Install Tree-sitter CLI
-        run: npm install -g tree-sitter-cli
-        shell: bash
-
       - name: Cache Generated Grammar
         uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
         id: cache-grammar
@@ -128,7 +124,7 @@ jobs:
           End
           EOF
 
-          tree-sitter parse --language=shellspec test_sample.shellspec --quiet || {
+          npx tree-sitter parse --language=shellspec test_sample.shellspec --quiet || {
             echo "❌ Parser failed on sample ShellSpec code"
             exit 1
           }