fix(cli): load plugin registry for message/channels commands

Fixes #1327 - 'clawdbot message --channel telegram' fails with
'Unknown channel: telegram' because plugins weren't loaded.

The Commander code path (non-route-first) calls ensureConfigReady() in
preAction but doesn't load the plugin registry. Channel plugins like
telegram are registered during plugin loading, so getChannelPlugin()
returns undefined without it.

This adds ensurePluginRegistryLoaded() call for commands that need
channel plugin access: message, channels, directory.

src/cli/program/preaction.ts

@@ -3,6 +3,7 @@ import { defaultRuntime } from "../../runtime.js";
 import { emitCliBanner } from "../banner.js";
 import { getCommandPath, hasHelpOrVersion } from "../argv.js";
 import { ensureConfigReady } from "./config-guard.js";
+import { ensurePluginRegistryLoaded } from "../plugin-registry.js";
 
 function setProcessTitleForCommand(actionCommand: Command) {
   let current: Command = actionCommand;
@@ -14,6 +15,9 @@ function setProcessTitleForCommand(actionCommand: Command) {
   process.title = `clawdbot-${name}`;
 }
 
+// Commands that need channel plugins loaded
+const PLUGIN_REQUIRED_COMMANDS = new Set(["message", "channels", "directory"]);
+
 export function registerPreActionHooks(program: Command, programVersion: string) {
   program.hook("preAction", async (_thisCommand, actionCommand) => {
     setProcessTitleForCommand(actionCommand);
@@ -23,5 +27,9 @@ export function registerPreActionHooks(program: Command, programVersion: string)
     const commandPath = getCommandPath(argv, 2);
     if (commandPath[0] === "doctor") return;
     await ensureConfigReady({ runtime: defaultRuntime, commandPath });
+    // Load plugins for commands that need channel access
+    if (PLUGIN_REQUIRED_COMMANDS.has(commandPath[0])) {
+      ensurePluginRegistryLoaded();
+    }
   });
 }