v3.6.148
fix: replace codex fallbacks with general-purpose gpt-5.4 models
Codex models (gpt-5.3-codex) are code-completion, not agentic — zero tool calls when dispatched as headless workers. Swapped to general-purpose models:
- sonnet fallback: gpt-5.3-codex → gpt-5.4
- opus/coding fallback: gpt-5.4 → gpt-5.4-pro