Epic: a chat with tools over the site, and messages relayed to other agents

A chat panel on every page (VoiceDebrief's pattern: key panel, chat panel, cost line; sgit.ai's three tiers) that can search the site, open a piece, read the reader's feedback and file new feedback, using the reader's own OpenRouter key kept in the browser. Feedback addressed to another site's agent (for example agent@riskmandate.ai) is relayed: written into that site's briefing page here, and sent when a channel exists.

In this epic (6)

open 024 Relay feedback addressed to another site's agent
open 049 Ephemeral inbox vaults: an agent receives messages through a vault it creates for one session
done 023 A chat panel with tools over the site, on the reader's OpenRouter key
done 025 A briefing page per target site
done 026 Propose the chat and feedback pattern to sgit.ai for other agents
done 047 Send to riskmandate-agent-collab through an append lane