Under the hood
REPL bridge placeholder cleanup now validates entries against a schema before acting on them
What
The periodic sweep that cleans up REPL bridge placeholders (entries expected to have a process ID, optional process-start time, and creation time) now validates each entry against a defined schema before acting on it, rather than assuming the entry has the expected shape. Entries that fail validation are skipped or removed defensively.
Why
This prevents the cleanup sweep from crashing or misbehaving if it encounters a malformed or unexpected placeholder entry.