Function parseLockContent

src/update.ts:140–154

* Parse a lock file's contents. Understands both the current JSON payload and * the legacy plain-integer PID format written by older teamai versions, so an * on-disk lock from a previous install is still evaluated for staleness rather * than treated as un-owned garbage.

(content: string)

 * than treated as un-owned garbage.
 */
function parseLockContent(content: string): { pid: number; owner?: string } | null {
  const trimmed = content.trim();
  if (!trimmed) return null;
  try {
    const parsed = JSON.parse(trimmed) as Partial<LockPayload>;
    if (typeof parsed.pid === 'number' && !isNaN(parsed.pid)) {
      return { pid: parsed.pid, owner: typeof parsed.owner === 'string' ? parsed.owner : undefined };
    }
    return null;
  } catch {
    // Legacy format: the file held only the bare PID as a string.
    const pid = parseInt(trimmed, 10);
    return isNaN(pid) ? null : { pid };
  }
}

/**
 * Inspect the lock at `resolved` and report whether it is stale — its owning