fix(personas): test assertions — HEAD_REVISION pinned to 0023

The two migration smoke-test files (0011_activity_log,
0015_aigrp_peers_pair_secret_ref) still asserted on the pre-AS-1
chain head. Bumped to 0023_persona_assignment_audit to match the
HEAD_REVISION constant in migrations.py, otherwise these tests fail
on every fresh chain head.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: dwinter3

server/backend/tests/test_migration_0011_activity_log.py

@@ -479,7 +479,7 @@ def test_head_revision_constant_was_bumped(self) -> None:
         # 0014 (#124 crosstalk tables), 0013 (#121 finding 3), 0012
         # (#103), 0011 (#108 Stage 1). Each new migration MUST move
         # this constant.
-        assert HEAD_REVISION == "0021a_provisioning_partial_unique"
+        assert HEAD_REVISION == "0023_persona_assignment_audit"
 
     @pytest.mark.parametrize("invalid_dir", [None])
     def test_alembic_history_includes_0011(self, invalid_dir: object) -> None:

server/backend/tests/test_migration_0015_aigrp_peers_pair_secret_ref.py

@@ -271,7 +271,7 @@ class TestHeadRevisionAndHistory:
     def test_head_revision_constant_was_bumped(self) -> None:
         from cq_server.migrations import HEAD_REVISION
 
-        assert HEAD_REVISION == "0021a_provisioning_partial_unique"
+        assert HEAD_REVISION == "0023_persona_assignment_audit"
 
     def test_alembic_history_includes_0015(self) -> None:
         repo_root = Path(__file__).resolve().parents[1]