feat(agent): Introduce identity profile for agents with normalization and default values

backend/alembic/versions/f7b3d0a1c9e2_add_agent_identity_profile.py

@@ -0,0 +1,28 @@
+"""Add agent identity profile.
+
+Revision ID: f7b3d0a1c9e2
+Revises: c1c8b3b9f4d1
+Create Date: 2026-02-04 22:45:00.000000
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "f7b3d0a1c9e2"
+down_revision = "c1c8b3b9f4d1"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "agents",
+        sa.Column("identity_profile", sa.JSON(), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("agents", "identity_profile")