[Parent] Track and resolve recurring agentic workflow execution failures (non-rate-limit) #1549

Recurring [aw] workflow runs are failing or producing no safe outputs for reasons unrelated to AI-credits rate limits. This parent tracks those failures for diagnosis and resolution.

Sub-issues

• [aw] Bash Step Hygiene Auditor failed #1544 — Bash Step Hygiene Auditor failed
• [aw] Clippy Fixer failed #1533 — Clippy Fixer failed
• [aw] Bash Step Hygiene Auditor failed #1523 — Bash Step Hygiene Auditor failed
• [aw] Bash Step Hygiene Auditor failed #1493 — Bash Step Hygiene Auditor failed
• [aw] Test Gap Finder failed #1485 — Test Gap Finder failed
• [aw] Copilot Model List Updater reported incomplete result #1483 — Copilot Model List Updater reported incomplete result
• [aw] Bash Step Hygiene Auditor failed #1459 — Bash Step Hygiene Auditor failed
• [aw] Test Reducer produced no safe outputs #1435 — Test Reducer produced no safe outputs

Goal

Identify root causes (broken tooling, flaky pipelines, infrastructure issues, prompt regressions) and resolve or close each failure report. Rate-limit failures are tracked separately in #1535.

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