fix: make ReloadConfigResult fields optional with default empty arrays

The Supervisor API doesn't always return 'changed' and 'removed' arrays
when reloading configuration, causing Zod validation errors.

Made all three fields (added, changed, removed) optional with default
empty arrays to handle cases where the API omits them.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/supervisor/types.ts

@@ -92,9 +92,9 @@ export const ConfigInfoSchema = z.object({
 });
 
 export const ReloadConfigResultSchema = z.object({
-  added: z.array(z.array(z.string())),
-  changed: z.array(z.array(z.string())),
-  removed: z.array(z.array(z.string())),
+  added: z.array(z.array(z.string())).optional().default([]),
+  changed: z.array(z.array(z.string())).optional().default([]),
+  removed: z.array(z.array(z.string())).optional().default([]),
 });
 
 // TypeScript Types