[deep-report] Fix set_issue_type safe-output handler silent failure (record-low 94.76% success rate) #64711

Description

The set_issue_type safe-output handler is failing silently in 100% of 10 occurrences observed in the last 24h, across 3 Smoke Copilot workflow variants (Smoke Copilot, Smoke Copilot - AOAI (apikey), Smoke Copilot - AOAI (Entra)), on both an in-development branch and a scheduled main-branch run. In every case the handler produces no item in safe_outputs.items and the job-level "Process Safe Outputs" step concludes failure, while every sibling safe-output item in the same batch succeeds. This is driving the safe_outputs job success rate to a monitor-record low of 94.76% (previous worst: 97.17% on 2026-09-23).

Affected runs (per the 2026-10-01 Safe Output Health Report): 36745551409, 36745556440, 36745561562 (commit bc0233b), 36762114132, 36762134104 (commit f19087b), 36795117785, 36797299158 (main branch, scheduled trigger, commit 856e7fa), 36812740323, 36812743202, 36812746071 (commit e4da7f0).

Expected Impact

Restores visibility into set_issue_type failures (currently silent/no-result) and prevents a single handler failure from hard-failing the whole safe_outputs job when sibling items succeed.

Acceptance Criteria

• Root cause of the silent/no-result failure in set_issue_type identified (handler exception, GraphQL mutation failure, or permissions gap)
• Fix applied so set_issue_type either succeeds or fails with a clear, logged error in safe-output-errors.json
• A single set_issue_type failure no longer hard-fails the whole safe_outputs job when sibling items succeed (soft-skip or isolated failure reporting)

Suggested Agent

Developer (relevant code: pkg/workflow/set_issue_type.go, pkg/workflow/safe_output_handlers.go, pkg/workflow/safe_outputs_handler_registry_issues.go)

Estimated Effort

Small–Medium

Data Source

DeepReport Intelligence Briefing, 2026-10-01 ~06:44Z cycle, sourced from Safe Output Health Report discussion #64689 (2026-10-01).

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• expires on Oct 2, 2026, 10:52 PM UTC-08:00