feat(agents): Add agent provisioning confirmation mechanism and update message structure

backend/alembic/versions/6df47d330227_add_agent_provision_confirmation.py

@@ -0,0 +1,41 @@
+"""add agent provision confirmation
+
+Revision ID: 6df47d330227
+Revises: e0f28e965fa5
+Create Date: 2026-02-04 17:16:44.472239
+
+"""
+from __future__ import annotations
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = '6df47d330227'
+down_revision = 'e0f28e965fa5'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS provision_requested_at TIMESTAMP"
+    )
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS provision_confirm_token_hash VARCHAR"
+    )
+    op.execute(
+        "ALTER TABLE agents ADD COLUMN IF NOT EXISTS provision_action VARCHAR"
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS provision_action"
+    )
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS provision_confirm_token_hash"
+    )
+    op.execute(
+        "ALTER TABLE agents DROP COLUMN IF EXISTS provision_requested_at"
+    )