Ollama can't use tools so it was never useful as a chat fallback — it
just caused confusing "both providers unavailable" errors. The chat
now uses Claude exclusively with clear error messages on failure.
- Remove chatWithOllama(), checkOllamaHealth()
- Simplify chat() to call Claude directly
- Remove Ollama UI indicators and "Limited mode" warning
- Clean up provider types (remove "ollama" union member)
Note: Ollama is still used for embedding generation (nomic-embed-text)
via the embedding service — only the LLM chat fallback is removed.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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