Use the live inference model catalog

[ananay]

Summary

• Replaces the bundled hosted catalog with metadata fetched from inference and adds OpenHack/OpenAI tabs with release-ordered family sections.
• Adds context tiers for the expanded models and preserves OpenRouter reasoning details across tool turns while excluding private reasoning from logs and saved sessions.
• Updates setup/provider plumbing, documentation, and regression coverage.

Testing

• uv run pytest -q — 493 passed.