feat: add /add-guild slash command

plugin/index.ts

@@ -9,6 +9,7 @@ import { registerBeforePromptBuildHook } from "./hooks/before-prompt-build.js";
 import { registerBeforeMessageWriteHook } from "./hooks/before-message-write.js";
 import { registerMessageSentHook } from "./hooks/message-sent.js";
 import { registerDirigentCommand } from "./commands/dirigent-command.js";
+import { registerAddGuildCommand } from "./commands/add-guild-command.js";
 import { registerDirigentTools } from "./tools/register-tools.js";
 import { ensurePolicyStateLoaded, persistPolicies, policyState } from "./policy/store.js";
 import { buildAgentIdentity, buildUserIdToAccountIdMap, resolveAccountId } from "./core/identity.js";
@@ -201,6 +202,9 @@ export default {
       ensurePolicyStateLoaded,
     });
 
+    // Register add-guild command
+    registerAddGuildCommand(api);
+
     // Handle NO_REPLY detection before message write
     registerBeforeMessageWriteHook({
       api,