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/workflows/test.yml

@@ -0,0 +1,65 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  test:
+    name: 🧪 Test Suite
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        node-version: [22, 24]
+      fail-fast: false
+
+    steps:
+      - name: 🏗️ Setup Development Environment
+        uses: ./.github/actions/setup-dev
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: 🧪 Test Grammar
+        uses: ./.github/actions/test-grammar
+
+  lint:
+    name: 🧹 Code Quality
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: 🏗️ Setup Node.js Environment
+        uses: ./.github/actions/setup-node
+
+      - name: 🧹 Run Linter
+        uses: ivuorinen/actions/pr-lint@22e6add79fabcca4bf5761452a51e4fa0207e155 # 25.9.8
+
+  coverage:
+    name: 📊 Test Coverage
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    needs: test
+
+    steps:
+      - name: 🏗️ Setup Development Environment
+        uses: ./.github/actions/setup-dev
+        with:
+          node-version: 24
+
+      - name: 📊 Test Coverage Analysis
+        uses: ./.github/actions/test-coverage
+        with:
+          minimum-tests: 55