feat(mattermost): register /oc_queue as a native slash command

Add oc_queue to DEFAULT_COMMAND_SPECS so the native slash-command registrar exposes /oc_queue, mapped (originalName: queue) to the core /queue directive via the existing trigger-map path. Additive; rides the same registration/callback machinery as the other oc_* commands.

extensions/mattermost/src/mattermost/slash-commands.test.ts

@@ -108,6 +108,15 @@ describe("slash-commands", () => {
     ).toEqual(["oc_model", "oc_models"]);
   });
 
+  it("registers the queue command mapped to the core /queue directive", () => {
+    const queueSpec = DEFAULT_COMMAND_SPECS.find((spec) => spec.trigger === "oc_queue");
+    expect(queueSpec?.originalName).toBe("queue");
+    const triggerMap = new Map<string, string>([["oc_queue", "queue"]]);
+    expect(resolveCommandText("oc_queue", " collect drop:summarize ", triggerMap)).toBe(
+      "/queue collect drop:summarize",
+    );
+  });
+
   it("normalizes callback path in slash config", () => {
     const config = resolveSlashCommandConfig({ callbackPath: "api/channels/mattermost/command" });
     expect(config.callbackPath).toBe("/api/channels/mattermost/command");

extensions/mattermost/src/mattermost/slash-commands.ts

@@ -172,6 +172,13 @@ export const DEFAULT_COMMAND_SPECS: MattermostCommandSpec[] = [
     autoComplete: true,
     autoCompleteHint: "[on|off]",
   },
+  {
+    trigger: "oc_queue",
+    originalName: "queue",
+    description: "Adjust active-run queue behavior",
+    autoComplete: true,
+    autoCompleteHint: "[steer|followup|collect|interrupt] [debounce:2s] [cap:N] [drop:old|new|summarize]",
+  },
 ];
 
 // ─── Command registration ────────────────────────────────────────────────────