Route Codex Aliases to GPT-5.5

[Trecek]

Summary

Codex model aliases now route sonnet, opus, and haiku to gpt-5.5, preventing
default Codex fleet sessions from launching on forbidden 5.4-era model IDs. The local
class distinction is preserved through model_reasoning_effort.

The doctor allowlist and model-alias regression tests now reject gpt-5.4 and
gpt-5.4-mini as Codex alias targets.

Closes #4218

Implementation Plan

Plan file: /home/talon/projects/generic_automation_mcp/.autoskillit/temp/prepare-pr/plan_codex_model_alias_gpt55_4218.md

Generated via AutoSkillit

[Trecek]

AutoSkillit PR Review — Verdict: changes_requested

[Trecek]

AutoSkillit PR Review — Verdict: approved_with_comments

[Trecek]

AutoSkillit PR Review — Verdict: approved_with_comments

[Trecek]

AutoSkillit review: warning-only findings detected. See inline comments — no blocking changes required.

[Trecek]

AutoSkillit PR Review — Verdict: approved_with_comments

Warning-level findings detected: 1 mutation-after-import concern, 1 lossy return type concern. No blocking issues. See inline comments.

[Trecek]

AutoSkillit PR Review — Verdict: approved_with_comments

[Trecek]

AutoSkillit PR Review — Verdict: approved_with_comments

AutoSkillit review: warning-only findings detected. See inline comments — no blocking changes required.

⚠️ Outside Diff Range

These findings target lines not in the diff and could not be posted as inline comments:

tests/execution/test_model_alias_registry.py

• L24 [warning/duplication]: Hardcoded model ID strings {'sonnet': 'gpt-5.5', 'opus': 'gpt-5.5', 'haiku': 'gpt-5.5'} in monkeypatch duplicate the sam
• L48 [warning/duplication]: Same hardcoded model ID strings as L24. Centralizing the alias monkeypatch into a fixture/helper would reduce duplicatio

[Trecek]

AutoSkillit review passed. No blocking issues found — all new findings match prior resolved threads (within ±5 line tolerance) on the same files and are suppressed by the prior-resolution rule.