feature: add supervisord support for docker image intergration

PR_DESCRIPTION.md

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+# Add Supervisor Process Management Module
+
+This introduces a **supervisor module** that wraps ML frameworks with supervisord for automatic crash recovery and robust process management. It can be integrated into any Dockerfile easily.
+
+## Integration
+
+Install and use with these commands:
+
+```bash
+pip install model-hosting-container-standards
+standard-supervisor vllm serve model --host 0.0.0.0 --port 8080
+```
+
+Or in a Dockerfile:
+```dockerfile
+COPY model_hosting_container_standards-0.1.2-py3-none-any.whl /tmp/
+RUN pip install supervisor
+RUN pip install /tmp/model_hosting_container_standards-0.1.2-py3-none-any.whl
+
+# Use supervisor entrypoint for SageMaker
+ENV ENGINE_AUTO_RECOVERY=true
+ENV ENGINE_MAX_RECOVERY_ATTEMPTS=3
+ENTRYPOINT ["standard-supervisor", "./sagemaker-entrypoint.sh"]
+```
+
+## Workflow
+
+1. **Parse command and environment** → Read ML framework command and supervisor configuration
+2. **Generate supervisord config** → Create robust configuration with configparser
+3. **Start supervisord** → Launch supervisor daemon with your framework as managed process
+4. **Monitor and restart** → Supervisor detects crashes and restarts automatically with configurable limits
+5. **Handle failures** → After max retries, container exits gracefully with proper error codes
+
+### **Key Components**
+
+**Core Modules:**
+- `models.py` - Configuration data models with comprehensive validation and environment variable parsing
+- `generator.py` - Robust supervisord configuration generation using configparser
+
+**CLI Tools & Scripts:**
+- `scripts/standard_supervisor.py` - Main CLI tool for running ML frameworks under supervisor (`standard-supervisor`)
+- `scripts/generate_supervisor_config.py` - Standalone configuration generator CLI
+
+**Documentation & Tests:**
+- `README.md` - Comprehensive setup guide with examples
+- `tests/integration/test_supervisor_cli_integration.py` - **Real behavior integration tests** that verify actual restart and retry behavior
+- `tests/supervisor/` - Comprehensive unit tests for all components
+
+## Usage Examples
+
+### Simple CLI Usage
+```bash
+# Direct command execution with supervisor
+standard-supervisor vllm serve model --host 0.0.0.0 --port 8080
+
+# With custom configuration
+PROCESS_MAX_START_RETRIES=5 SUPERVISOR_PROGRAM__APP_STARTSECS=30 \
+standard-supervisor python -m tensorrt_llm.hlapi.llm_api
+```
+
+### Dockerfile Integration
+```dockerfile
+FROM vllm/vllm-openai:latest
+
+# Install with supervisor support
+RUN pip install model-hosting-container-standards
+
+# Configure your ML framework with supervisor settings
+ENV PROCESS_MAX_START_RETRIES=3
+ENV SUPERVISOR_PROGRAM__APP_STARTSECS=30
+ENV SUPERVISOR_PROGRAM__APP_STOPWAITSECS=60
+ENV LOG_LEVEL=info
+
+# Use supervisor for process management
+ENTRYPOINT ["python", "-m", "model_hosting_container_standards.supervisor.scripts.standard_supervisor"]
+CMD ["vllm", "serve", "model", "--host", "0.0.0.0", "--port", "8080"]
+```
+
+## Configuration Options
+
+**Basic Configuration:**
+- Command line arguments become the supervised process command
+- `PROCESS_MAX_START_RETRIES=3` - Maximum startup attempts before giving up (0-100)
+- `LOG_LEVEL=info` - Logging level (debug, info, warn, error, critical)
+
+**Advanced Supervisor Settings:**
+- `SUPERVISOR_PROGRAM__APP_STARTSECS=30` - Time process must run to be considered "started"
+- `SUPERVISOR_PROGRAM__APP_STOPWAITSECS=60` - Time to wait for graceful shutdown
+- `SUPERVISOR_PROGRAM__APP_AUTORESTART=true` - Enable automatic restart on failure
+- `SUPERVISOR_PROGRAM__APP_STARTRETRIES=3` - Startup retry attempts
+- `SUPERVISOR_CONFIG_PATH=/tmp/supervisord.conf` - Custom config file location
+
+**Custom Sections:**
+- `SUPERVISOR_SUPERVISORD_LOGLEVEL=debug` - Supervisord daemon log level
+- `SUPERVISOR_EVENTLISTENER__MEMMON_COMMAND=memmon -a 200MB` - Add custom event listeners
+
+## Testing & Validation
+
+**Comprehensive Test Suite:**
+- **Integration Tests** - Actual supervisor processes that verify continuous restart and retry limit behavior
+**Test Coverage:**
+- **Continuous restart behavior** - Verifies supervisor actually restarts failed processes
+- **Startup retry limits** - Confirms supervisor respects retry limits and gives up appropriately
+- **Signal handling** - Tests graceful shutdown with SIGTERM
+- **ML framework integration** - Tests with realistic ML framework startup patterns
+- **Configuration generation** - Validates all supervisor configuration options
+- **Error handling** - Tests invalid configurations and edge cases
+
+**Manual Testing:**
+- Tested with vLLM dockerfile build
+- Verified with `docker exec` process killing to confirm restart behavior
+- Validated in production-like container environments

python/MANIFEST.in

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+# Include supervisor scripts
+recursive-include model_hosting_container_standards/supervisor/scripts *
+
+# Include documentation
+include README.md
+include LICENSE
+
+# Include configuration files
+include pyproject.toml
+
+# Exclude development files
+exclude .gitignore
+exclude .pre-commit-config.yaml
+recursive-exclude * __pycache__
+recursive-exclude * *.py[co]
+recursive-exclude * .DS_Store