auto-curation agent: tag, summarize, and link sessions for you

[youdie006]

sessionwiki is the substrate (a searchable, linkable wiki of sessions). The agentic layer sits on top: a background pass that

• auto-tags sessions by topic/project,
• auto-summarizes new sessions (already possible via summarize; make it automatic),
• proposes links between related sessions,
• and surfaces nudges like "3 abandoned sessions in this project - resume one?"

The wiki earns its name today through manual tags/notes/related; this makes curation automatic. Opt-in, local, using the user's own LLM CLI (same BYO model as summarize).