fix(mattermost): clarify model picker runtime behavior

CHANGELOG.md

@@ -64,6 +64,7 @@ Docs: https://docs.openclaw.ai
 - Channels/plugins: key bundled package-state probes, env/config presence, and read-only command defaults by channel id instead of manifest plugin id, preserving setup and native-command detection for channel plugins whose package id differs from the channel alias. Thanks @vincentkoc.
 - Docker: prune package-excluded plugin dist directories from runtime images unless the build explicitly opts that plugin in, so official external plugins such as Feishu stay install-on-demand instead of shipping partial metadata without compiled runtime output. Fixes #77424. Thanks @vincentkoc.
 - Model switching: include the exact additive allowlist repair command when `/model ... --runtime ...` targets a blocked model, and make Telegram's model picker say that it changes only the session model while leaving the runtime unchanged. Thanks @vincentkoc.
+- Mattermost: clarify that the model picker only changes the session model and that runtime switches require `/oc_model <provider/model> --runtime <runtime>`. Thanks @vincentkoc.
 - Doctor/config: keep active `auth.profiles` metadata intact when `doctor --fix` strips stale secret fields from configs, repairing legacy `<provider>:default` API-key profile metadata when model fallbacks or explicit `model@profile` refs still depend on it. Fixes #77400.
 - CLI/update: disable and skip plugins that fail package-update plugin sync, so a broken npm/ClawHub/git/marketplace plugin cannot turn a successful OpenClaw package update into a failed update result. Thanks @vincentkoc.
 - CLI/update: use an absolute POSIX npm script shell during package-manager updates, so restricted PATH environments can still run dependency lifecycle scripts while updating from `--tag main`. Fixes #77530. Thanks @PeterTremonti.

extensions/mattermost/src/mattermost/model-picker.test.ts

@@ -57,6 +57,8 @@ describe("Mattermost model picker", () => {
     expect(view.text).toContain("Current: openai/gpt-5");
     expect(view.text).toContain("Tap below to browse models");
     expect(view.text).toContain("/oc_model <provider/model> to switch");
+    expect(view.text).toContain("Browse keeps the current runtime");
+    expect(view.text).toContain("/oc_model <provider/model> --runtime <runtime>");
     expect(view.buttons[0]?.[0]?.text).toBe("Browse providers");
   });
 

extensions/mattermost/src/mattermost/model-picker.ts

@@ -273,7 +273,7 @@ export function renderMattermostModelSummaryView(params: {
       "",
       "Tap below to browse models, or use:",
       "/oc_model <provider/model> to switch",
-      "/oc_model <provider/model> --runtime <runtime> for runtime",
+      "Browse keeps the current runtime; use /oc_model <provider/model> --runtime <runtime> to switch runtime too",
       "/oc_model status for details",
     ].join("\n"),
     buttons: [