Initial release of the Evaluator Contract extension.
- JSON Schema for evaluator results (6 outcomes, 14 finding kinds, 5 evidence kinds)
- 4 commands: run, compose, report, route
- 4 hooks: after_specify, after_plan, after_tasks, after_implement
- 3 parity scripts: Python, Bash, PowerShell
- Quick-start demo and 70 tests