d8fe61131c
Three agent builder files used falsy checks that incorrectly nullified uiSelectedModel when override objects existed but had no model set: - sisyphus-agent.ts: `?.model ?` → `?.model !== undefined ?` - atlas-agent.ts: `?.model ?` → `?.model !== undefined ?` - general-agents.ts: `!override?.model` → `override?.model === undefined` This caused user model selection in web mode to revert to defaults. Fixes #2351