refactor(tests): merge detect_suggested_procedure into expected_detection

Two overlapping TestTemplate fields (expected_detection: narrative
guidance from imports/leads; detect_suggested_procedure: concrete
commands from approved suggestions) are now one. Blue-side procedure
suggestions target expected_detection directly, appending onto
whatever is already there rather than overwriting it — same
merge-not-overwrite behavior already used for the red side. Existing
detect_suggested_procedure data is folded into expected_detection
before the column is dropped.

backend/alembic/versions/b063_merge_detect_suggested_into_expected.py

@@ -0,0 +1,40 @@
+"""Merge TestTemplate.detect_suggested_procedure into expected_detection.
+
+Two overlapping fields on TestTemplate — expected_detection (narrative
+guidance, populated by imports and leads since long before this feature)
+and detect_suggested_procedure (concrete commands, populated only via the
+procedure-suggestion approval workflow) — are consolidated into one:
+expected_detection. Any existing detect_suggested_procedure text is
+appended (not overwritten) onto expected_detection before the column is
+dropped, so nothing already approved is lost.
+
+Revision ID: b063
+Revises: b062
+Create Date: 2026-07-15
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "b063"
+down_revision = "b062"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        UPDATE test_templates
+        SET expected_detection = CASE
+            WHEN expected_detection IS NULL OR expected_detection = '' THEN detect_suggested_procedure
+            ELSE expected_detection || E'\n' || detect_suggested_procedure
+        END
+        WHERE detect_suggested_procedure IS NOT NULL AND detect_suggested_procedure != ''
+        """
+    )
+    op.drop_column("test_templates", "detect_suggested_procedure")
+
+
+def downgrade() -> None:
+    op.add_column("test_templates", sa.Column("detect_suggested_procedure", sa.Text(), nullable=True))