- Replace getattr(self.session_store, '_db', None) with self._session_db
(the GatewayRunner's own SessionDB, consistent with existing usage in
slash_commands.py L240/L499).
- Remove verbose comment referencing a branch name as an issue number.
- Update stale comment in run.py that said 'today it has no session_db'.
- Add regression test verifying session_db is passed and rotated session
is persisted (adapted from #51624 by @LeonSGP43).
- Add _session_db=None to _make_runner fixtures in test_compress_command,
test_compress_focus, and test_compress_plugin_engine.
Manual /compress crashed with 'LCMEngine' object has no attribute
'_align_boundary_forward' when any context-engine plugin was active.
The gateway handler reached into _align_boundary_forward and
_find_tail_cut_by_tokens on tmp_agent.context_compressor, but those
are ContextCompressor-specific — not part of the generic ContextEngine
ABC — so every plugin engine (LCM, etc.) raised AttributeError.
- Add optional has_content_to_compress(messages) to ContextEngine ABC
with a safe default of True (always attempt).
- Override it in the built-in ContextCompressor using the existing
private helpers — preserves exact prior behavior for 'compressor'.
- Rewrite gateway /compress preflight to call the ABC method, deleting
the private-helper reach-in.
- Add focus_topic to the ABC compress() signature. Make _compress_context
retry without focus_topic on TypeError so older strict-sig plugins
don't crash on manual /compress <focus>.
- Regression test with a fake ContextEngine subclass that only
implements the ABC (mirrors LCM's surface).
Reported by @selfhostedsoul (Discord, Apr 22).
