Concurrency configurability and fail-fast on fatal errors

[tangym]

Summary

Adds independent concurrency configuration for judge and seeds stages, and implements fail-fast cancellation when fatal LLM errors are detected.

Changes

1. Independent concurrency per stage

Previously, judge reused rollout.concurrency and seeds hardcoded concurrency to 8. Each stage now has its own YAML key:

• pipeline.judge.concurrency (default: 10)
• pipeline.seeds.concurrency (default: 8)

Defaults preserve existing behavior. Example:

pipeline:
  seeds:
    concurrency: 4
  rollout:
    concurrency: 10
  judge:
    concurrency: 5

2. Fail-fast on fatal LLM errors

When an LLMAuthError or LLMInputError hits one task in rollout or judge, all remaining tasks are now cancelled immediately. These errors (bad API key, invalid request) cannot succeed on retry, so continuing wastes API budget.

Transient errors (LLMRateLimitError, LLMProviderError) are unaffected and still collected without cancelling peers.

Also fixed build_run_viewer_artifacts to guard against missing transcripts file when all seeds fail.

Testing

• 9 new config validation tests (defaults, custom values, invalid values, YAML parsing)
• 1 new fail-fast integration test (verifies task cancellation on LLMAuthError)
• All 73 relevant tests pass, no regressions

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[AaronAspinwall123]

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