feat: implement complete tree-sitter-shellspec grammar with comprehensive testing

- Add full ShellSpec grammar extending tree-sitter-bash
- Support all ShellSpec constructs: Describe, Context, It, hooks, utilities
- Include Data block parsing with statements and argument styles
- Add 61 comprehensive test cases covering real-world patterns
- Implement optimized GitHub workflows with CI/CD automation
- Configure complete development tooling (linting, formatting, pre-commit)
- Add comprehensive documentation and contribution guidelines
- Optimize grammar conflicts to zero warnings
- Support editor integration for Neovim, VS Code, Emacs

Breaking Changes:
- Initial release, no previous API to break

BREAKING CHANGE: Initial implementation of tree-sitter-shellspec grammar

# Conflicts:
#	.github/workflows/codeql.yml
#	.github/workflows/pr-lint.yml
#	.pre-commit-config.yaml

# Conflicts:
#	.github/workflows/pr-lint.yml

# Conflicts:
#	.github/workflows/pr-lint.yml

.github/actions/setup-dev/action.yml

@@ -0,0 +1,38 @@
+---
+name: "Setup Development Environment"
+description: "Complete setup for tree-sitter-shellspec development including Node.js and Tree-sitter"
+
+inputs:
+  node-version:
+    description: "Node.js version to setup"
+    required: false
+    default: "24"
+  registry-url:
+    description: "NPM registry URL"
+    required: false
+    default: ""
+  skip-checkout:
+    description: "Skip repository checkout (if already done)"
+    required: false
+    default: "false"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Checkout Repository
+      if: inputs.skip-checkout != 'true'
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+    - name: Setup Node.js ${{ inputs.node-version }}
+      uses: actions/setup-node@7c12f8017d5436eb855f1ed4399f037a36fbd9e8 # v5.2.1
+      with:
+        node-version: ${{ inputs.node-version }}
+        cache: npm
+        registry-url: ${{ inputs.registry-url }}
+
+    - name: Install Dependencies
+      run: npm ci || { echo "❌ npm install failed" && npm install }
+      shell: bash
+
+    - name: Setup Tree-sitter Environment
+      uses: ./.github/actions/setup-treesitter