identity: Próspera agentic-companies pilot framing — no personal names

- README: the stack belongs to Cayce, an autonomous entity operating under
  the Próspera ZEDE agentic-companies jurisdiction pilot; the experiment is
  managed by Cayce itself
- tests: approver actor renamed to the generic label operator
- zero occurrences of personal names in the tree (verified with grep)

tests/integration/test_pg_roles.py

@@ -197,7 +197,7 @@ def test_roles_full_daemon_cycle(roles_applied):
     sig = "c9" * 64  # invented 128-hex signature for the permission test
     with _connect_as("cayce_approver") as conn, conn.cursor() as cur:
         cur.execute(
-            f"UPDATE proposals SET status='APPROVED', approved_by='gustavo', "
+            f"UPDATE proposals SET status='APPROVED', approved_by='operator', "
             f"approved_at=now(), operator_signature='{sig}' WHERE id={proposal_id}"
         )
 
@@ -225,7 +225,7 @@ def test_roles_full_daemon_cycle(roles_applied):
     with _connect_as("cayce_approver") as conn, conn.cursor() as cur:
         cur.execute(
             "UPDATE mail_messages SET draft_status='APPROVED', "
-            "approved_by='gustavo', approved_hash='"
+            "approved_by='operator', approved_hash='"
             + "a" * 64
             + f"', operator_signature='{sig}' WHERE id={mail_id}"
         )