3d56df4e1b
Deep category now uses gpt-5.4 as its default model across all providers (openai, github-copilot, venice, opencode), matching Hephaestus's GPT 5.4 upgrade. The requiresModel constraint is removed since gpt-5.4 is widely available. Adds openai/gpt-5.3-codex -> openai/gpt-5.4 config migration for existing user configs. Deep category prompt optimized for GPT 5.4's stronger native capabilities (leaner, less verbose).