Dogfood GR00T visual evidence artifacts

[MiaoDX]

Summary

• add GR00T-style semantic snapshot, renderer report, autonomous report evidence models and proof packs
• add static, suite, paired visual review artifacts and persisted review summaries
• keep GR00T runtime/renderers owned downstream and baseline blessing explicit

Verification

• uv run ruff check focused RoboHarness evidence/approval files
• uv run mypy focused RoboHarness evidence/approval files
• uv run pytest -q tests/unit/evidence/test_proof_pack.py tests/unit/approval/test_visual_review.py tests/unit/cli/test_cli.py --cov-fail-under=0
• GR00T dogfood focused tests passed locally against the editable checkout