[Code Quality] Distinguish pre-agent vs long-run 0-turn copilot CLI failures for smarter retry

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Description

The Agentic Workflow Audit repeatedly observes two distinct classes of copilot Execute-CLI 0-turn failures that are currently treated identically:

1. Pre-agent startup failures — agent dies before doing any work (0 tokens, negligible cost)
2. Long-run then exit failures — agent completes substantial work (30+ minutes, 119–210 AIC) but the CLI wrapper exits non-zero, discarding all completed output

Class 2 wastes significant resources with no recovery path.

From the Agentic Workflow Audit — 2026-07-18 #46492:

"3 of today's fails lost 30–31 min of real agent work + 119–210 aic to a post-work CLI exit. Distinguishing pre-agent startup fails (0-tok) from longrun-then-exit fails, and retrying only the latter, would recover completed work."

Suggested Changes

• In the copilot engine driver (likely pkg/workflow/engines/copilot/ or similar), add token-usage detection to classify failures:
  • If TokenUsage == 0 at exit: classify as startup failure (no retry needed)
  • If TokenUsage > threshold at non-zero exit: classify as long-run failure (safe-outputs may still be recoverable)
• Log the distinction in the failure summary for audit visibility.
• Optionally: on long-run exit, attempt to read any partial safe-output declarations before discarding.

Files Affected

• pkg/workflow/engines/copilot/ — CLI driver exit handling
• pkg/workflow/ — run lifecycle / failure classification

Success Criteria

• Long-run failures (>10K tokens) are distinguishable from startup failures in run logs.
• Audit reports can report accurate wasted-AIC by failure class.
• Existing tests pass; no behavior change for pre-agent startup failures.

Source

Extracted from Agentic Workflow Audit — 2026-07-18 #46492

Priority

High — recovers 119–210 AIC per occurrence on long-run failures; directly impacts fleet cost efficiency.

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• expires on Jul 19, 2026, 5:31 PM UTC-08:00