Add an opt-in ideation layer that turns ranked story clusters into content angles. A Provider interface backs four models: qwen (default, local Ollama), OpenAI, and Gemini share one OpenAI-compatible client; an Anthropic Messages client is written against raw net/http (no vendor SDK, uniform + dep-light). Results persist in ai_notes with a UNIQUE(cluster_id, provider) index (migration 0003), so re-ideation upserts in place.
The ideate command skips any (cluster, provider) that already has a note unless --force is passed; benign classifier refusals get their own counter and never fail the run. In the TUI, i ideates the selected cluster inline and renders an AI IDEAS section in the dossier; it is a no-op unless AI is enabled and only acts in the detail view.
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