feat: auto-escalate model on worker failure + extend timeouts (t314)

[marcusquinn]

Summary

• Auto-escalate task model to next tier (e.g., sonnet→opus) when workers fail, so retries use a more capable model
• Increase hung worker timeout from 30min to 1h and max runtime from 2h to 4h
• Records failure patterns for future routing decisions

Problem

Workers dispatched with model:sonnet for complex tasks (t311.2, t311.3, t303) consistently hung at the 30min timeout. On retry, the same sonnet model was used again, producing the same failure. The existing quality gate escalation only triggers for completed tasks that fail quality checks — it never fires for hung/crashed workers.

Changes

Change	Before	After
SUPERVISOR_WORKER_TIMEOUT	1800s (30min)	3600s (1h)
SUPERVISOR_WORKER_MAX_RUNTIME	7200s (2h)	14400s (4h)
Model on failure	Same model reused	Auto-escalate via get_next_tier()

New function escalate_model_on_failure() is called from attempt_self_heal() before creating diagnostic subtasks. Uses existing escalation_depth/max_escalation columns (from t132.6) to prevent infinite escalation.

Testing

• bash -n syntax check: PASS
• ShellCheck: no new warnings
• Diff: 90 insertions, 3 deletions

Ref #1212

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/t314

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[github-actions]

🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 15 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Thu Feb 12 03:52:20 UTC 2026: Code review monitoring started
Thu Feb 12 03:52:20 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 15

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 15
• VULNERABILITIES: 0

Generated on: Thu Feb 12 03:52:22 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud