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/gateway/protocol.ts

@@ -109,7 +109,7 @@ export type OutboundMessage = GatewayResponse | GatewayError | GatewayEvent;
 // ── Validation helpers ─────────────────────────────────────────
 
 export function isValidRequest(msg: unknown): msg is GatewayRequest {
-  if (typeof msg !== 'object' || msg === null) return false;
+  if (typeof msg !== 'object' || msg === null) {return false;}
   const obj = msg as Record<string, unknown>;
   return (
     typeof obj.id === 'number' &&
@@ -121,7 +121,7 @@ export function isValidRequest(msg: unknown): msg is GatewayRequest {
 export function parseMessage(raw: string): GatewayRequest | null {
   try {
     const parsed = JSON.parse(raw);
-    if (isValidRequest(parsed)) return parsed;
+    if (isValidRequest(parsed)) {return parsed;}
     return null;
   } catch {
     return null;