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/test-grammar/action.yml

@@ -0,0 +1,77 @@
+---
+name: "Test Tree-sitter Grammar"
+description: "Runs comprehensive grammar tests including parser validation"
+
+inputs:
+  skip-sample-test:
+    description: "Skip the sample ShellSpec code test"
+    required: false
+    default: "false"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run Tests
+      run: npm test
+      shell: bash
+
+    - name: Build Parser
+      run: npm run build
+      shell: bash
+
+    - name: Test Parser with Sample Code
+      if: inputs.skip-sample-test != 'true'
+      run: |
+        cat << 'EOF' > test_sample.shellspec
+        #!/usr/bin/env shellspec
+
+        Describe 'Calculator'
+          Include ./lib/calculator.sh
+
+          Before 'setup_calculator'
+          After 'cleanup_calculator'
+
+          Context 'when adding numbers'
+            It 'adds two positive numbers'
+              When call add 2 3
+              The output should eq 5
+            End
+
+            It 'handles zero'
+              When call add 0 5
+              The output should eq 5
+            End
+          End
+
+          Context 'when input is invalid'
+            Skip if "validation not implemented" ! command -v validate
+
+            It 'handles empty input'
+              When call add "" ""
+              The status should be failure
+            End
+          End
+        End
+
+        It 'works without describe block'
+          When call echo "test"
+          The output should eq "test"
+        End
+        EOF
+
+        tree-sitter parse test_sample.shellspec --quiet || {
+          echo "❌ Parser failed on sample ShellSpec code"
+          exit 1
+        }
+        echo "✅ Parser successfully handled sample code"
+      shell: bash
+
+    - name: Validate Parser (Simple)
+      if: inputs.skip-sample-test == 'true'
+      run: |
+        echo "Describe 'test' It 'works' End End" | tree-sitter parse --language=shellspec || {
+          echo "❌ Parser validation failed"
+          exit 1
+        }
+        echo "✅ Parser validation successful"
+      shell: bash