The history trimming logic cleared session_id = None whenever entries
exceeded history_size. Since the history was always at capacity, every
new message wiped the session_id immediately after storing it. This
meant --resume was never passed to Claude Code, making every turn a
fresh conversation.
Fix: preserve session_id on trim. Claude Code's --resume loads the
full conversation from its own session transcript on disk, so trimming
our local tracking entries doesn't invalidate the session.
Also adds debug logging for session_id capture/storage (temporary).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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