fix(sessions): record transcript_revision in the salvage schema history

1fc1999769 added sessions.transcript_revision (GW-18) without an event in
hermes_cli/session_schema_history.py, so page-level salvage could not infer the layout of
any sessions row written by this build: test_layout_inference_survives_every_derived_id_shape
left 38 rows unrecognized, and test_replayed_history_ends_at_current_schema[sessions] failed.
Appended event 32 at the end, as the module asks; no older event is touched.

Refs #134889 (GW-18)
Refs #140719

hermes_cli/session_schema_history.py

@@ -213,6 +213,8 @@ SCHEMA_HISTORY: dict[str, _TableHistory] = {
             ('+', 'runtime_revision', 'id'),
             ('+', 'runtime_generation', 'runtime_revision'),
         )),
+        # GW-18 (package 10, #140968): write-side revision a transcript-derived cache keys on.
+        ('32 2026-10-18T10:11Z 1fc1999769', (('+', 'transcript_revision', 'tool_names'),)),
         ),
     ),
     "messages": _TableHistory(