fix: drop explicit ui:install step

src/gateway/control-ui.ts

@@ -157,7 +157,7 @@ export function handleControlUiHttpRequest(
     res.statusCode = 503;
     res.setHeader("Content-Type", "text/plain; charset=utf-8");
     res.end(
-      "Control UI assets not found. Build them with `bun run ui:build` (or run `bun run ui:dev` during development).",
+      "Control UI assets not found. Build them with `pnpm ui:build` (auto-installs UI deps), or run `pnpm ui:dev` during development.",
     );
     return true;
   }

src/infra/control-ui-assets.ts

@@ -76,7 +76,7 @@ export async function ensureControlUiAssetsBuilt(
     return {
       ok: false,
       built: false,
-      message: `${hint}. Build them with \`bun run ui:build\`.`,
+      message: `${hint}. Build them with \`pnpm ui:build\` (auto-installs UI deps).`,
     };
   }
 
@@ -94,27 +94,7 @@ export async function ensureControlUiAssetsBuilt(
     };
   }
 
-  runtime.log("Control UI assets missing; building (ui:build)…");
-
-  const ensureInstalled = !fs.existsSync(
-    path.join(repoRoot, "ui", "node_modules"),
-  );
-  if (ensureInstalled) {
-    const install = await runCommandWithTimeout(
-      [process.execPath, uiScript, "install"],
-      {
-        cwd: repoRoot,
-        timeoutMs: opts?.timeoutMs ?? 10 * 60_000,
-      },
-    );
-    if (install.code !== 0) {
-      return {
-        ok: false,
-        built: false,
-        message: `Control UI install failed: ${summarizeCommandOutput(install.stderr) ?? `exit ${install.code}`}`,
-      };
-    }
-  }
+  runtime.log("Control UI assets missing; building (ui:build, auto-installs UI deps)…");
 
   const build = await runCommandWithTimeout(
     [process.execPath, uiScript, "build"],

src/infra/update-runner.ts

@@ -304,15 +304,6 @@ export async function runGatewayUpdate(
         timeoutMs,
       ),
     );
-    steps.push(
-      await runStep(
-        runCommand,
-        "ui:install",
-        managerScriptArgs(manager, "ui:install"),
-        gitRoot,
-        timeoutMs,
-      ),
-    );
     steps.push(
       await runStep(
         runCommand,