feat: kernelbench

[cmunley1]

Runs kernel bench and supports any harness in gym or simple agent for one-shot like the official benchmark.

What does this PR do?

Checklist

• I have read the contributing guidelines.
• The change is focused; unrelated "drive-by" edits are tracked as separate issues/PRs.
• Tests added or updated and pass locally, or N/A for docs-only / non-code changes (so CI unit/server checks pass when applicable).
• Pre-commit checks pass locally (pre-commit run --all-files) (so CI lint/format/copyright pass).
• All commits have DCO sign-off (git commit -s) (so the DCO check passes).

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[cmunley1]

/ok to test e298630

[cmunley1]

/claude review

[claude]

Review incomplete: the PR head advanced during review. Analysis was performed against e298630febd00d0561aa030e350aa8af3d74207a (the captured head), but the final revision check found the head is now 5ee036c88a0f2983413c4554590c52eed93cdfa2. Inline findings would be anchored to a stale commit, so none were posted. Please re-run the review against the current head.

[cmunley1]

/ok to test 03fbf25