Add attended prune of retired bao.coulomb.social callbacks from platform-admin

Read-preserve-write via the reviewed loopback helper; keeps the tunnel
callback and every other setting; also captures non-secret OIDC mount config.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 150322@bnt-lap001
Assistant-Session: 16a7b788-374e-4915-a1df-fc87ffd9a5e4

tests/test_openbao_platform_admin_callback_prune.py

@@ -0,0 +1,58 @@
+import copy
+import importlib.util
+import json
+from pathlib import Path
+
+import pytest
+
+spec = importlib.util.spec_from_file_location(
+    'prune', Path(__file__).resolve().parents[1] / 'scripts/openbao_platform_admin_callback_prune.py')
+m = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(m)
+
+DECLARED = json.loads((Path(__file__).resolve().parents[1] / 'openbao/auth/netkingdom-platform-admin-role.json').read_text())
+
+
+def live(role):
+    state = {'role': copy.deepcopy(role)}
+    writes = []
+
+    def write(value):
+        writes.append(value)
+        state['role'].update(value)
+    return state, writes, (lambda: copy.deepcopy(state['role'])), write
+
+
+def test_prunes_only_the_two_retired_callbacks_and_keeps_settings():
+    role = dict(DECLARED, allowed_redirect_uris=list(DECLARED['allowed_redirect_uris']) + list(m.RETIRED)
+                if not set(m.RETIRED) <= set(DECLARED['allowed_redirect_uris']) else list(DECLARED['allowed_redirect_uris']))
+    state, writes, read, write = live(role)
+    changed, uris = m.prune(read, write)
+    assert changed and len(writes) == 1
+    assert not set(m.RETIRED) & set(uris)
+    assert m.KEEP in uris and 'http://localhost:8250/oidc/callback' in uris
+    assert state['role']['token_policies'] == ['platform-admin', 'operator-custody']
+    assert state['role']['bound_claims'] == {'groups': ['net-kingdom-admins']}
+
+
+def test_idempotent_when_already_pruned():
+    role = dict(DECLARED, allowed_redirect_uris=[u for u in DECLARED['allowed_redirect_uris'] if u not in m.RETIRED])
+    _, writes, read, write = live(role)
+    assert m.prune(read, write)[0] is False and writes == []
+
+
+def test_refuses_without_tunnel_callback():
+    role = dict(DECLARED, allowed_redirect_uris=list(m.RETIRED))
+    _, writes, read, write = live(role)
+    with pytest.raises(m.Refused, match='tunnel_callback_missing'):
+        m.prune(read, write)
+    assert writes == []
+
+
+def test_refuses_when_readback_drops_other_settings():
+    role = copy.deepcopy(DECLARED)
+    calls = iter([copy.deepcopy(role), copy.deepcopy(role),
+                  dict(copy.deepcopy(role), token_ttl=60,
+                       allowed_redirect_uris=[u for u in role['allowed_redirect_uris'] if u not in m.RETIRED])])
+    with pytest.raises(m.Refused, match='readback_settings_changed'):
+        m.prune(lambda: next(calls), lambda value: None)