Gateway Session Hygiene auto-compression destroyed the original transcript
when the throwaway hygiene agent couldn't rotate the session (#21301, P1).
The _hyg_agent is built WITHOUT a session_db, so _compress_context cannot
end-and-fork the session (its rotate block is gated on agent._session_db).
The session_id stays unchanged, and the rewrite_transcript() call ran
UNCONDITIONALLY — replacing the full original transcript with just the
head+summary list. Permanent data loss on every hygiene compaction.
Guard the rewrite behind 'rotated OR in-place' exactly like the /compress
path already does (#44794/#39704): only overwrite when a new session id
was minted or in-place compaction succeeded; otherwise preserve the
original transcript and log a warning. The token/count bookkeeping that
followed the rewrite is moved inside the guard, with no-change values in
the preserve branch.
Co-authored-by: SandroHub013 <sandrohub013@gmail.com>
Co-authored-by: WuTianyi123 <wtyopenclaw@gmail.com>
Co-authored-by: kyssta-exe <kyssta-exe@users.noreply.github.com>
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