Improve orphaned local heartbeat recovery

Persist child-process metadata for local adapter runs, keep detached runs alive when their pid still exists, queue a single automatic retry when the pid is confirmed dead, and clear detached warnings when the original run reports activity again.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/types/heartbeat.ts

@@ -33,6 +33,10 @@ export interface HeartbeatRun {
   stderrExcerpt: string | null;
   errorCode: string | null;
   externalRunId: string | null;
+  processPid: number | null;
+  processStartedAt: Date | null;
+  retryOfRunId: string | null;
+  processLossRetryCount: number;
   contextSnapshot: Record<string, unknown> | null;
   createdAt: Date;
   updatedAt: Date;