Adds a new get_feed tool that lets the AI assistant read posts from any
feed source and summarize activity for the user. Supports:
- Named feeds: follows, global, ditto, and user's saved feeds
- Country feeds: NIP-73 geographic comments via iso3166 codes
- Ad-hoc queries: kinds, authors, search, hashtags via spell resolution
The system prompt is now dynamic, injecting saved feed labels so the
model knows which feeds are available. buildSystemPrompt accepts an
optional savedFeedLabels parameter for this.
Lemon
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