Adds a new rill validate command that validates and reconciles Rill projects without starting the UI. Useful for CI/CD or AI agent development workflows.

  # Human-readable validation
  rill validate
  # JSON output on cmd line
  rill validate --format json
  # Save results to file
  rill validate --output-file validation-results.json
  # Custom timeout for model reconciliation (default time out is 60 seconds)
  rill validate --model-timeout-seconds 300
  # Suppress all log output and output results as json
  rill validate --silent --format json

Json output is of format

{
    "summary": {
      "total_resources": 15,
      "parse_errors": 2,
      "reconcile_errors": 1
    },
    "parse_errors": [
      {
        "message": "syntax error at line 10",
        "file_path": "models/bad.sql",
        "start_line": 10
      }
    ],
    "resources": [
      {
        "kind": "model",
        "name": "user_metrics",
        "status": "error",
        "error": "column 'email' does not exist",
        "file_path": "models/user_metrics.sql",
        "timeout": false
      }
    ]
  }

If validation is successful then exit code is 0 otherwise cmd returns with non zero exit code and prints a summary error message.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!