chore(operation-trace): rebase migration onto master head, drop unused import

The pull request merge produced two Alembic heads: this branch's
0032_operation_traceability and master's 0032_cert_artifact_digest both
descended from 0031_merge_totp_assistant, so the integration and migration
jobs failed with "Multiple head revisions". Renumber the traceability
migration to 0033 and point it at master's head (0032_cert_artifact_digest),
restoring a single linear head.

Also replace the noqa'd unused import of the traceability routes with an
importlib bootstrap (addresses the CodeQL unused-import finding) and merge
origin/master to pick up the certification digest backfill.

src/langbot/pkg/persistence/alembic/versions/0033_operation_traceability.py

@@ -1,7 +1,7 @@
 """add workspace operation traceability table
 
-Revision ID: 0032_operation_traceability
-Revises: 0031_merge_totp_assistant
+Revision ID: 0033_operation_traceability
+Revises: 0032_cert_artifact_digest
 Create Date: 2026-09-25
 
 The table is append-only and tenant-owned. Fresh installs already receive it
@@ -22,8 +22,8 @@ import sqlalchemy as sa
 from alembic import op
 
 
-revision = '0032_operation_traceability'
-down_revision = '0031_merge_totp_assistant'
+revision = '0033_operation_traceability'
+down_revision = '0032_cert_artifact_digest'
 branch_labels = None
 depends_on = None