feat(eval-image): measured Dockerfile and publish-eval-image workflow

[echobt]

Summary

Owns the measured ghcr.io/baseintelligence/agent-challenge-canonical image:

• Reproducible Dockerfile (SOURCE_DATE_EPOCH, BuildKit named contexts for golden assets + agent-challenge tree)
• workflow_dispatch publish workflow co-pinning AGENT_CHALLENGE_REF + GOLDEN_ASSETS_REF
• Contract tests + docs (docs/eval-image.md)
• Python 3.12 floor + lockfile

Test plan

• CI green on this PR
• Contract tests cover Dockerfile / workflow shape
• First real publish still needs a golden-assets digest (ops follow-up)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1c6759cb-4254-4f77-b990-597c7c028b8d

📥 Commits

Reviewing files that changed from the base of the PR and between 1cf65f9 and e9862ca.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• .github/workflows/publish-eval-image.yml
• .gitignore
• Dockerfile
• README.md
• docs/eval-image.md
• pyproject.toml
• tests/test_eval_image_contract.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/eval-image-dockerfile-ci

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