fix(discord): dedupe native skill commands by skillName (#17365)

* fix(discord): dedupe native skill commands by skill name

* Changelog: credit Discord skill dedupe

---------

Co-authored-by: yume <yume@yumedeMacBook-Pro.local>
Co-authored-by: Shadow <hi@shadowing.dev>

src/discord/monitor/provider.skill-dedupe.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { __testing } from "./provider.js";
+
+describe("dedupeSkillCommandsForDiscord", () => {
+  it("keeps first command per skillName and drops suffix duplicates", () => {
+    const input = [
+      { name: "github", skillName: "github", description: "GitHub" },
+      { name: "github_2", skillName: "github", description: "GitHub" },
+      { name: "weather", skillName: "weather", description: "Weather" },
+      { name: "weather_2", skillName: "weather", description: "Weather" },
+    ];
+
+    const output = __testing.dedupeSkillCommandsForDiscord(input);
+    expect(output.map((entry) => entry.name)).toEqual(["github", "weather"]);
+  });
+
+  it("treats skillName case-insensitively", () => {
+    const input = [
+      { name: "ClawHub", skillName: "ClawHub", description: "ClawHub" },
+      { name: "clawhub_2", skillName: "clawhub", description: "ClawHub" },
+    ];
+    const output = __testing.dedupeSkillCommandsForDiscord(input);
+    expect(output).toHaveLength(1);
+    expect(output[0]?.name).toBe("ClawHub");
+  });
+});