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/README.md

@@ -0,0 +1,120 @@
+# Composite Actions
+
+This directory contains reusable composite actions to reduce duplication across workflows.
+
+## Available Actions
+
+### setup-node
+
+Sets up Node.js with caching and installs dependencies.
+
+**Inputs:**
+
+- `node-version` (optional): Node.js version, defaults to '24'
+- `registry-url` (optional): NPM registry URL
+
+**Usage:**
+
+```yaml
+- uses: ./.github/actions/setup-node
+  with:
+    node-version: 22
+```
+
+### setup-treesitter
+
+Installs Tree-sitter CLI and generates the grammar.
+
+**Usage:**
+
+```yaml
+- uses: ./.github/actions/setup-treesitter
+```
+
+### setup-dev
+
+Complete development environment setup (combines setup-node + setup-treesitter).
+
+**Inputs:**
+
+- `node-version` (optional): Node.js version, defaults to '24'
+- `registry-url` (optional): NPM registry URL
+- `skip-checkout` (optional): Skip repository checkout, defaults to 'false'
+
+**Usage:**
+
+```yaml
+- uses: ./.github/actions/setup-dev
+  with:
+    node-version: 24
+    skip-checkout: 'true'
+```
+
+### test-grammar
+
+Runs comprehensive grammar tests including parser validation.
+
+**Inputs:**
+
+- `skip-sample-test` (optional): Skip complex sample test, defaults to 'false'
+
+**Usage:**
+
+```yaml
+- uses: ./.github/actions/test-grammar
+  with:
+    skip-sample-test: 'true'
+```
+
+### test-coverage
+
+Analyzes test coverage and validates minimum requirements.
+
+**Inputs:**
+
+- `minimum-tests` (optional): Minimum tests required, defaults to '55'
+
+**Outputs:**
+
+- `total-tests`: Total number of tests found
+- `passing-tests`: Number of passing tests
+- `coverage-percent`: Test coverage percentage
+
+**Usage:**
+
+```yaml
+- uses: ./.github/actions/test-coverage
+  with:
+    minimum-tests: 60
+```
+
+## Workflow Usage Examples
+
+### Test Workflow (Simplified)
+
+```yaml
+jobs:
+  test:
+    steps:
+      - uses: ./.github/actions/setup-dev
+        with:
+          node-version: ${{ matrix.node-version }}
+      - uses: ./.github/actions/test-grammar
+```
+
+### Release Workflow (Simplified)
+
+```yaml
+jobs:
+  test:
+    steps:
+      - uses: ./.github/actions/setup-dev
+      - uses: ./.github/actions/test-grammar
+        with:
+          skip-sample-test: 'true'
+
+  lint:
+    steps:
+      - uses: ./.github/actions/setup-node
+      - uses: ivuorinen/actions/pr-lint@latest
+```