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/automation/heartbeat.ts

@@ -73,7 +73,7 @@ export class HeartbeatMonitor {
 
   /** Start the heartbeat monitor. Does nothing if disabled. */
   start(): void {
-    if (!this.deps.config.enabled) return;
+    if (!this.deps.config.enabled) {return;}
 
     const intervalMs = parseInterval(this.deps.config.interval);
     console.log(`HeartbeatMonitor: starting (interval=${this.deps.config.interval}, checks=[${this.deps.config.checks.join(', ')}])`);
@@ -290,7 +290,7 @@ export class HeartbeatMonitor {
 
   private async notify(text: string): Promise<void> {
     const notifyConfig = this.deps.config.notify;
-    if (!notifyConfig) return;
+    if (!notifyConfig) {return;}
 
     const adapter = this.deps.channelLookup.get(notifyConfig.channel);
     if (!adapter) {