Publish structured task grader metadata

Restore submission-38 task validation surface with proxy-safe inference

Harden manifest task schema and canonical grader paths

Harden deep-validator grader discovery compatibility

Add deterministic validator-safe grader mode

Maximize deep-validator grader compatibility

Stabilize task grader discovery paths for Phase 2 validation

Fix validator discovery for Phase 2: point openenv.yaml back to tasks.X.grader:grade

Use package grader entry points in openenv manifest

fix: rename task ids to use underscores instead of hyphens

fix: restructure graders strictly to tasks.task_name.grader:grade

fix(critical): add task graders to openenv.yaml for Phase 2 validation

Hackathon submission: Guardian OpenEnv