Summary

• add a new oagent:check-provider-setup IPC preflight to detect provider configuration issues before a turn starts
• validate OpenRouter key presence and Ollama endpoint reachability (/api/tags probe with timeout)
• expose the preflight via preload + renderer typings as window.clientCore.checkProviderSetup(...)
• use this preflight in session send/revive paths so misconfigured runs produce a clear Setup required: ... system message instead of generic/stuck processing
• include explicit fix guidance in messages: add OpenRouter key, start/fix Ollama, or switch provider

Validation

• code-level verification of wiring and error flow in draft send + revive paths
• local TypeScript/build checks could not be run in this environment (node_modules/.bin/tsc unavailable)

Closes #26