Function encode_captured_record 

pub fn encode_captured_record(record: &CapturedRecord) -> String

What: Encode captured.json in the incumbent’s field order, with a newline. Why: The capture writes exactly these bytes.

In TS you’d write (pseudocode):

`${JSON.stringify({ schemaVersion: 2, state: 'captured', worktreeId, sequence, nextSequenceBeforeBase, worktreePaths })}\n`