Let the coordinator manage skills, MCP servers and tools, behind a confirm card

- Coordinator tools in its own chat (super admin only): list_extensions,
  set_extension_access, delete_extension, and update_skill /
  update_mcp_server / update_custom_tool for what can't change where
  anything is sent (on/off, names, arguments, left-out tools)
- Adding a skill, MCP server or tool, or changing a skill's words, a
  server's URL or headers or a tool's kind or config, goes through
  propose_skill / propose_mcp_server / propose_custom_tool: stored in
  extension_proposals with the bot's background check, shown as a
  [proposal:ID] chip that opens a card with Confirm and Reject
- The card's facts are worked out by the app from what Confirm saves: the
  host, every {{env.KEY}} and whether it's saved, the config; for a skill
  its links, hosts, tool names, mentions of secrets and a diff against
  the saved runbook
- Confirming decides once and checks again; a server or tool missing a key
  is saved switched off, and the outcome is posted to the bot in chat
- Never from a bot: stdio servers, a URL whose host a template decides,
  envs in a prompt tool, a key's value

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/data/app-data.ts

@@ -292,6 +292,20 @@ export const AppData = {
     SkillBodyMaxChars: 60000,
     SkillBodyShownChars: 30000,
     SkillDescriptionMaxChars: 300,
+    /**
+     * How long the super admin has to confirm an MCP server or tool the
+     * coordinator proposed (`extension_proposals`). After that its card
+     * reads expired and the bot has to propose it again, so a card left in
+     * an old thread can't be confirmed weeks later.
+     */
+    ExtensionProposalTtlMs: 24 * 60 * 60 * 1000,
+    /**
+     * A proposal's background check: the bot's summary, and the sources it
+     * read (at least one).
+     */
+    ExtensionResearchMinChars: 40,
+    ExtensionResearchMaxChars: 6000,
+    ExtensionResearchSourcesMax: 10,
     /**
      * `search_computers`: how long the command may run on each computer,
      * and how much of each computer's output the bot reads.