Add `turnstone-bootstrap`, a new entry point that uses any LLM (OpenAI,
Anthropic, or local/vLLM) to conversationally walk users through
configuring a Turnstone deployment. Generates .env files, setup.sh
scripts, and optional docker-compose overrides.
- Fully interactive startup (zero CLI args) with provider/model selection
- Auto-detects available models on local OpenAI-compatible endpoints
- 7 tools: read_file, write_file, generate_secret, check_port,
validate_api_key, check_docker, finish
- Path traversal protection on file read/write
- Duplicate write detection (skips identical content)
- Bounded retry loop (3 attempts) on LLM errors
- Anthropic message conversion with consecutive-role merging