Function post_record 

pub fn post_record(envelope: &str) -> Value

Build a structured log record for one PostToolUse envelope — the call as it actually executed (event: "post"), paired with whether it used ct. Logged alongside the pre records in the same daily file so an analysis can correlate a steer decision with the follow-up call by session_id and time. Lenient, and stamps no time (the caller does).