The workspace setup chat ran on the smart model. The hidden kickoff turn
enqueued its job without a `modelId`, and the frontend sends none unless
the user picks one, so every turn fell through to `modelId ??
workspace.smartModel` in `chat-execution.service.ts`.
Two halves, since the kickoff is server-initiated and the frontend never
sends it:
- `startHiddenKickoffStream` takes a `modelId` and the setup chat passes
`workspace.fastModel`.
- `useAgentChatModelId` requests `workspace.fastModel` on the setup
page, so user turns follow. Everywhere else it still sends nothing and
the server fallback is unchanged.
`workspace.fastModel` defaults to the `default-fast-model` sentinel, so
the model still resolves through the registry and stays
admin-overridable. An explicit pick from the model picker still wins.
Raphaël Bosi
a9084604b4