fix: quiet update banner and skip duplicate plugin CLI

src/cli/program/preaction.ts

@@ -4,6 +4,7 @@ import { emitCliBanner } from "../banner.js";
 import { getCommandPath, getVerboseFlag, hasHelpOrVersion } from "../argv.js";
 import { ensureConfigReady } from "./config-guard.js";
 import { ensurePluginRegistryLoaded } from "../plugin-registry.js";
+import { isTruthyEnvValue } from "../../infra/env.js";
 import { setVerbose } from "../../globals.js";
 
 function setProcessTitleForCommand(actionCommand: Command) {
@@ -22,15 +23,21 @@ const PLUGIN_REQUIRED_COMMANDS = new Set(["message", "channels", "directory"]);
 export function registerPreActionHooks(program: Command, programVersion: string) {
   program.hook("preAction", async (_thisCommand, actionCommand) => {
     setProcessTitleForCommand(actionCommand);
-    emitCliBanner(programVersion);
     const argv = process.argv;
     if (hasHelpOrVersion(argv)) return;
+    const commandPath = getCommandPath(argv, 2);
+    const hideBanner =
+      isTruthyEnvValue(process.env.CLAWDBOT_HIDE_BANNER) ||
+      commandPath[0] === "update" ||
+      (commandPath[0] === "plugins" && commandPath[1] === "update");
+    if (!hideBanner) {
+      emitCliBanner(programVersion);
+    }
     const verbose = getVerboseFlag(argv, { includeDebug: true });
     setVerbose(verbose);
     if (!verbose) {
       process.env.NODE_NO_WARNINGS ??= "1";
     }
-    const commandPath = getCommandPath(argv, 2);
     if (commandPath[0] === "doctor") return;
     await ensureConfigReady({ runtime: defaultRuntime, commandPath });
     // Load plugins for commands that need channel access

src/cli/update-cli.ts

@@ -19,7 +19,6 @@ import {
   type UpdateStepInfo,
   type UpdateStepResult,
   type UpdateStepProgress,
-  type UpdateStepResult,
 } from "../infra/update-runner.js";
 import {
   detectGlobalInstallManagerByPresence,