Update Documentation

Sync documentation with the codebase, generating from source-of-truth files.

Step 1: Identify Sources of Truth

Step 2: Generate Script Reference

1. Read package.json (or Makefile, Cargo.toml, pyproject.toml)
2. Extract all scripts/commands with their descriptions
3. Generate a reference table:

| Command | Description |
|---------|-------------|
| `npm run dev` | Start development server with hot reload |
| `npm run build` | Production build with type checking |
| `npm test` | Run test suite with coverage |

Step 3: Generate Environment Documentation

1. Read .env.example (or .env.template, .env.sample)
2. Extract all variables with their purposes
3. Categorize as required vs optional
4. Document expected format and valid values

| Variable | Required | Description | Example |
|----------|----------|-------------|---------|
| `DATABASE_URL` | Yes | PostgreSQL connection string | `postgres://user:pass@host:5432/db` |
| `LOG_LEVEL` | No | Logging verbosity (default: info) | `debug`, `info`, `warn`, `error` |

Step 4: Update Contributing Guide

Generate or update docs/CONTRIBUTING.md with:

• Development environment setup (prerequisites, install steps)
• Available scripts and their purposes
• Testing procedures (how to run, how to write new tests)
• Code style enforcement (linter, formatter, pre-commit hooks)
• PR submission checklist

Step 5: Update Runbook

Generate or update docs/RUNBOOK.md with:

• Deployment procedures (step-by-step)
• Health check endpoints and monitoring
• Common issues and their fixes
• Rollback procedures
• Alerting and escalation paths

Step 6: Staleness Check

1. Find documentation files not modified in 90+ days
2. Cross-reference with recent source code changes
3. Flag potentially outdated docs for manual review

Step 7: Show Summary

Documentation Update
──────────────────────────────
Updated:  docs/CONTRIBUTING.md (scripts table)
Updated:  docs/ENV.md (3 new variables)
Flagged:  docs/DEPLOY.md (142 days stale)
Skipped:  docs/API.md (no changes detected)
──────────────────────────────

Rules

• Single source of truth: Always generate from code, never manually edit generated sections
• Preserve manual sections: Only update generated sections; leave hand-written prose intact
• Mark generated content: Use <!-- AUTO-GENERATED --> markers around generated sections
• Don't create docs unprompted: Only create new doc files if the command explicitly requests it