feat(cli+broker): kick, ban, unban, bans commands

Broker WS handlers:
- kick: disconnect peer(s) by name, --stale duration, or --all.
  Authz: owner or admin only. Closes WS + marks presence disconnected.
- ban: kick + set revokedAt on mesh.member. Hello already rejects
  revoked members, so ban is instant and permanent until unban.
- unban: clear revokedAt. Peer can rejoin with their existing keypair.
- list_bans: return all revoked members for a mesh.

Session-id dedup (previous commit): handleHello disconnects ghost
presences with matching (meshId, sessionId) before inserting the new
one. Eliminates duplicate entries after broker restarts.

CLI (alpha.37):
- claudemesh kick <peer|--stale 30m|--all>
- claudemesh ban/unban <peer>
- claudemesh bans [--json]
- Uses new sendAndWait() on ws-client for request-response pattern
  over WS (generic _reqId resolver).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/src/entrypoints/cli.ts

@@ -30,6 +30,12 @@ Mesh
   claudemesh delete [slug]         delete a mesh (alias: rm)
   claudemesh rename <slug> <name>  rename a mesh
   claudemesh share [email]         share mesh (invite link / send email)
+  claudemesh kick <peer>           disconnect a peer (can reconnect)
+  claudemesh kick --stale 30m      disconnect idle peers (> duration)
+  claudemesh kick --all            disconnect everyone except you
+  claudemesh ban <peer>            kick + permanently revoke (can't rejoin)
+  claudemesh unban <peer>          lift a ban
+  claudemesh bans                  list banned members
 
 Messaging
   claudemesh peers                 see who's online
@@ -133,6 +139,10 @@ async function main(): Promise<void> {
     case "delete": case "rm": { const { deleteMesh } = await import("~/commands/delete-mesh.js"); process.exit(await deleteMesh(positionals[0] ?? "", { yes: !!flags.y || !!flags.yes })); break; }
     case "rename": { const { rename } = await import("~/commands/rename.js"); process.exit(await rename(positionals[0] ?? "", positionals[1] ?? "")); break; }
     case "share": case "invite": { const { invite } = await import("~/commands/invite.js"); process.exit(await invite(positionals[0], { mesh: flags.mesh as string, json: !!flags.json })); break; }
+    case "kick": { const { runKick } = await import("~/commands/kick.js"); process.exit(await runKick(positionals[0], { mesh: flags.mesh as string, stale: flags.stale as string, all: !!flags.all })); break; }
+    case "ban": { const { runBan } = await import("~/commands/ban.js"); process.exit(await runBan(positionals[0], { mesh: flags.mesh as string })); break; }
+    case "unban": { const { runUnban } = await import("~/commands/ban.js"); process.exit(await runUnban(positionals[0], { mesh: flags.mesh as string })); break; }
+    case "bans": { const { runBans } = await import("~/commands/ban.js"); process.exit(await runBans({ mesh: flags.mesh as string, json: !!flags.json })); break; }
 
     // Messaging
     case "peers": { const { runPeers } = await import("~/commands/peers.js"); await runPeers({ mesh: flags.mesh as string, json: !!flags.json }); break; }