feat(skills): reload registry on watcher change events

src/skills/registry.ts

@@ -9,6 +9,14 @@ import type { Skill } from './types.js';
 export class SkillRegistry {
   private skills: Map<string, Skill> = new Map();
 
+  /** Replace all registered skills with the provided set. */
+  reset(skills: Skill[]): void {
+    this.skills.clear();
+    for (const skill of skills) {
+      this.skills.set(skill.manifest.name, skill);
+    }
+  }
+
   /** Register a skill. Replaces any existing skill with the same name. */
   register(skill: Skill): void {
     this.skills.set(skill.manifest.name, skill);