fix(models): fall back when catalog refresh stalls

[CreatorGhost]

Port of upstream anomalyco/opencode#36003.

Caps the models.dev catalog refresh with a 2s timeout and falls back to the cached/bundled catalog when the refresh stalls, so startup and model resolution never hang on a slow catalog endpoint. Our fork's rebrand commits do not touch models-dev.ts (verified via git log), so no adaptation was needed.

Verified: bun test test/models.test.ts (10 pass) and bun typecheck from packages/core. Applied cleanly.

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📥 Commits

Reviewing files that changed from the base of the PR and between f862420 and 178c906.

📒 Files selected for processing (2)

• packages/core/src/models-dev.ts
• packages/core/test/models.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch models-catalog-fallback

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