v0.92.44: Fix the status bar flipping while a resumed sub-agent runs

- Run only a resumed sub-agent's own steps on its saved provider, as a spawn does, so its progress updates and notices reach the main screen as the session.
- Notify app-state listeners outside any provider scope, and read the main session's provider in both status rows.
- Keep local build windows such as mistral 32K and llama3 8K to local runtimes; a hosted provider that does not list a model gets the default window.
- Keep the model-prices test independent of the machine's own table.