[deep-report] Unblock Changeset Generator: migrate off gpt-5.3-codex (404, stuck 9 days)

[github-actions]

Problem

Changeset Generator has failed for 9 consecutive days. Its model: gpt-5.3-codex resolves to gpt-5-codex-alpha-2025-11-07, which the Codex proxy rejects with a 404. Every run burns 4 retry attempts × 5 reconnects before giving up. The same recommendation has been pinned for 9 days with no action.

Fix (one line)

Change model: gpt-5.3-codex -> model: gpt-5.4 in .github/workflows/changeset-generator.md and recompile.

Note: Smoke Copilot also runs gpt-5.3-codex and failed in a related way on 2026-05-28 — worth reviewing whether it should migrate too.

Acceptance criteria

• model: gpt-5.4 in .github/workflows/changeset-generator.md
• Lock file regenerated
• Next run no longer returns 404 from the model proxy

Effort / suggested agent

~15 min. Compiler/recompile agent.

Source: [aw-audit] Daily Audit 2026-05-28 (discussion #35583).

Identified by DeepReport run §26647364565.

Generated by 🔬 DeepReport - Intelligence Gathering Agent · opus48 2.1M · ◷

• expires on May 31, 2026, 4:03 PM UTC

[github-actions]

🍪 Issue Monster selected this for Copilot

I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.

If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.

Om nom nom! 🍪

🍪 Om nom nom by Issue Monster · haiku45 41.7K · ◷