style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/skills/installer.ts

@@ -96,7 +96,7 @@ export class SkillInstaller {
     const entries = readdirSync(this.managedDir, { withFileTypes: true });
     return entries
       .filter(entry => {
-        if (!entry.isDirectory()) return false;
+        if (!entry.isDirectory()) {return false;}
         const skillMd = resolve(this.managedDir, entry.name, 'SKILL.md');
         return existsSync(skillMd);
       })

src/skills/registry.ts

@@ -13,7 +13,7 @@ export class SkillRegistry {
   register(skill: Skill): void {
     this.skills.set(skill.manifest.name, skill);
     console.log(
-      `Skill '${skill.manifest.name}' registered (${skill.manifest.tier}, ${skill.available ? 'available' : 'unavailable'})`
+      `Skill '${skill.manifest.name}' registered (${skill.manifest.tier}, ${skill.available ? 'available' : 'unavailable'})`,
     );
   }