feat(cloud): report planner transport status

packages/cloud-platform/cloud/migrations/versions/0006_host_planner_transport.py

@@ -0,0 +1,23 @@
+"""Record each Host's planner transport for governance visibility."""
+
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "0006_host_planner_transport"
+down_revision = "0005_cloud_token_usage"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "host_registrations",
+        sa.Column("planner_transport", sa.String(), nullable=False, server_default="direct"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("host_registrations", "planner_transport")