Separate clean and grid screenshot artifacts

[p-forghani]

Summary

• keep verifier-facing screenshot fields clean while writing separate grid-marked artifacts for the playtester agent
• expose grid images through gridScreenshot and captures[].gridPath while preserving screenshot and captures[].path as clean outputs
• remove the old gridScreenshots switch so grid artifacts are always produced for agent targeting
• update the playtest viewer to ignore .grid.png files and add coverage for controller response wiring, agent selection, and viewer filtering

Validation

• npm test passed: 96 passed, 1 skipped Linux-only recording smoke
• npm run test:py passed: 4 passed
• rg "gridScreenshots": no matches
• git diff --check: clean

[parsewave-bot]

TerminalBench Bot Commands

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/bot tb run [--dataset, --dataset-path, --dataset-config, --registry-url, --local-registry-path, --output-path, --run-id, --upload-results, --task-id, --n-tasks, --exclude-task-id, --no-rebuild, --cleanup, --use-subscription, --model, --agent, --agent-import-path, --agent-kwarg, --log-level, --livestream, --n-concurrent, --n-attempts, --global-timeout-multiplier, --global-agent-timeout-sec, --global-test-timeout-sec, --contributionsCommit]

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/bot full-check-v2 [--task-id <id>] [--analyze-failure] [...]
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Remove default flags: Use --no-{flag} to disable default flags (e.g., --no-use-subscription)

Aliases:
/bot /codex-attempts [--n, --task-id, --tasks-dir] → /bot /tb run --agent codex
/bot /claude-attempts [--n, --task-id, --tasks-dir] → /bot /tb run --agent claude-code
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/bot /oracle [--task-id, --tasks-dir] → /bot /tb run --agent oracle
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/bot /tb-debug [--task-id, --tasks-dir] → /bot /tb tasks debug

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[Lewington-pitsos]

after having a proper think about this I think its easier if we assume the judge only has access to the video recording

If it wants screenshots it can take them from there

otherwise the judge will need to know about the concept of a grid screenshot vs a non-grid screenshot and which paths each has. to me that seems like too much dependency

for now I think lets keep the screenshots as a purely playtester-facing + debugging artifact

this also allows us to avoid a little complexity, which is not insignificant

thoughts?