feat(webui): add skills marketplace

webui/src/lib/skill-events.ts

@@ -0,0 +1,18 @@
+import type { SkillsPayload } from "@/lib/types";
+
+export const SKILLS_CHANGED_EVENT = "nanobot:skills-changed";
+
+export function isSkillsPayload(value: unknown): value is SkillsPayload {
+  return (
+    !!value
+    && typeof value === "object"
+    && Array.isArray((value as { skills?: unknown }).skills)
+  );
+}
+
+export function notifySkillsChanged(payload: SkillsPayload): void {
+  if (typeof window === "undefined") return;
+  window.dispatchEvent(new CustomEvent<SkillsPayload>(SKILLS_CHANGED_EVENT, {
+    detail: payload,
+  }));
+}