An AI assistant pane in the TUI and web dashboard

[iamsaquib8]

An idea, not planned yet. A chat pane in stockwise tui and the serve dashboard that uses the same tool layer as stockwise ask and the MCP server, local model first. Depends on the eval set (#255) so answers stay correct and neutral. Comment if you would use this.

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Moved from issue #275 to keep the issue tracker for scheduled work. Upvote or comment if you would use this; ideas with demand go back on the roadmap.