feat: streamline GitHub Actions workflows and improve contributor experience

- Replace complex auto-version.yml with simple PR Docker build workflow
  - Builds Docker images for all PRs using pr-number-sha tagging
  - Removes redundant versioning logic (semantic-release handles this)
  - Adds automatic PR comments with Docker usage instructions

- Optimize test.yml workflow triggers
  - Remove redundant push triggers on main branch
  - Focus on PR testing only for better developer feedback

- Add docker-release.yml for production releases
  - Triggers on GitHub release publication
  - Multi-platform builds (linux/amd64, linux/arm64)
  - Updates release notes with Docker installation instructions

- Add semantic-release.yml workflow for automated versioning
  - Uses conventional commits for version bumping
  - Automatically generates releases and tags
  - Integrates with Docker workflow via release triggers

- Add pre-commit configuration for automatic code quality
  - Includes ruff (with auto-fix), black, isort
  - Provides faster development workflow option

- Enhance contribution documentation
  - Add pre-commit hook option as recommended approach
  - Keep manual script option for comprehensive testing
  - Improve developer workflow guidance

Fixes #215 (automatic changelog generation)
Addresses #110 (Docker builds automation)
References #107 (improved version tracking)

This creates a clean, modern CI/CD pipeline that eliminates redundancy
while addressing multiple community requests around changelog generation,
Docker builds, and release automation.

docs/contributions.md

@@ -23,8 +23,16 @@ We maintain high code quality standards. **All contributions must pass our autom
 
 #### Required Code Quality Checks
 
-Before submitting any PR, run our automated quality check script:
+**Option 1 - Automated (Recommended):**
+```bash
+# Install pre-commit hooks (one-time setup)
+pre-commit install
 
+# Now linting runs automatically on every commit
+# Includes: ruff (with auto-fix), black, isort
+```
+
+**Option 2 - Manual:**
 ```bash
 # Run the comprehensive quality checks script
 ./code_quality_checks.sh
@@ -32,7 +40,7 @@ Before submitting any PR, run our automated quality check script:
 
 This script automatically runs:
 - Ruff linting with auto-fix
-- Black code formatting 
+- Black code formatting
 - Import sorting with isort
 - Complete unit test suite (361 tests)
 - Verification that all checks pass 100%
@@ -56,7 +64,7 @@ python -m pytest -xvs
 python communication_simulator_test.py
 ```
 
-**Important**: 
+**Important**:
 - **Every single test must pass** - we have zero tolerance for failing tests in CI
 - All linting must pass cleanly (ruff, black, isort)
 - Import sorting must be correct
@@ -69,12 +77,12 @@ python communication_simulator_test.py
 1. **New features MUST include tests**:
    - Add unit tests in `tests/` for new functions or classes
    - Test both success and error cases
-   
+
 2. **Tool changes require simulator tests**:
    - Add simulator tests in `simulator_tests/` for new or modified tools
    - Use realistic prompts that demonstrate the feature
    - Validate output through server logs
-   
+
 3. **Bug fixes require regression tests**:
    - Add a test that would have caught the bug
    - Ensure the bug cannot reoccur
@@ -136,14 +144,14 @@ def process_model_response(
     max_tokens: Optional[int] = None
 ) -> ProcessedResult:
     """Process and validate model response.
-    
+
     Args:
         response: Raw response from the model provider
         max_tokens: Optional token limit for truncation
-        
+
     Returns:
         ProcessedResult with validated and formatted content
-        
+
     Raises:
         ValueError: If response is invalid or exceeds limits
     """
@@ -237,4 +245,4 @@ Contributors are recognized in:
 - Release notes for significant contributions
 - Special mentions for exceptional work
 
-Thank you for contributing to Zen MCP Server! Your efforts help make this tool better for everyone.
+Thank you for contributing to Zen MCP Server! Your efforts help make this tool better for everyone.