[deep-report] Treat add_comment 404s as warnings in safe output handler

[github-actions]

Description

Safe output health reported 404 "Not Found" errors when discussions were deleted between agent execution and safe output processing. Update the add_comment handler to downgrade 404s to warnings (continue processing other operations) while preserving errors for other status codes.

Expected Impact

Reduces false failure rates in safe output jobs and improves signal-to-noise in monitoring without masking real errors.

Suggested Agent

Safe Output Health Monitor

Estimated Effort

Medium (1-4 hours)

Data Source

DeepReport Intelligence Briefing - 2026-01-23 (see discussion #11409)

AI generated by DeepReport - Intelligence Gathering Agent

[github-actions]

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