fix: strip markdown formatting before HEARTBEAT_OK check

Claude sometimes wraps HEARTBEAT_OK in backticks or bold markers.
Strip leading formatting characters before the startsWith check.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Vesper

src/commands/start.ts

@@ -564,7 +564,8 @@ export async function start(args: string[] = []) {
         })
         .then((r) => {
           if (!r) return;
-          const shouldForward = currentSettings.heartbeat.forwardToTelegram || !r.stdout.trim().startsWith("HEARTBEAT_OK");
+          const stripped = r.stdout.trim().replace(/^[`*_ \n]+/, "");
+          const shouldForward = currentSettings.heartbeat.forwardToTelegram || !stripped.startsWith("HEARTBEAT_OK");
           if (shouldForward) {
             forwardToTelegram("", r);
             forwardToDiscord("", r);