chore(release): harden nick contract for v0.1.2

tests/test_v1_strategies.py

@@ -194,6 +194,36 @@ def test_admin_create_custom_nick_and_patch_nick_only_preserve_id_and_increment_
     assert repo.strategies[strategy_id].nick == "mom-primary"
 
 
+def test_admin_create_trims_nick() -> None:
+    repo = FakeStrategyRepo()
+    with _repos(repo):
+        created = _client().post(
+            "/v1/admin/strategies",
+            json={"name": "momentum", "nick": "  mom-20  ", "config": {"window": 20}},
+            headers=_auth("admin-token"),
+        )
+    assert created.status_code == 201
+    assert created.json()["nick"] == "mom-20"
+
+
+def test_admin_create_and_patch_reject_whitespace_only_nick() -> None:
+    repo = FakeStrategyRepo()
+    with _repos(repo):
+        created = _client().post(
+            "/v1/admin/strategies",
+            json={"name": "momentum", "nick": " \t ", "config": {"window": 20}},
+            headers=_auth("admin-token"),
+        )
+        changed = _client().patch(
+            "/v1/admin/strategies/active-1",
+            json={"nick": " \n "},
+            headers=_auth("admin-token"),
+        )
+    assert created.status_code == 422
+    assert changed.status_code == 422
+    assert repo.strategies["active-1"].nick == "target_value:base"
+
+
 def test_admin_patch_omitting_nick_preserves_custom_nick_when_name_and_config_change() -> None:
     repo = FakeStrategyRepo()
     with _repos(repo):
@@ -227,6 +257,24 @@ def test_admin_create_omitting_nick_retains_legacy_generated_value() -> None:
     assert created.json()["nick"] == expected
 
 
+def test_admin_create_and_patch_accept_explicit_null_nick() -> None:
+    repo = FakeStrategyRepo()
+    with _repos(repo):
+        created = _client().post(
+            "/v1/admin/strategies",
+            json={"name": "legacy-null", "nick": None, "config": {}},
+            headers=_auth("admin-token"),
+        )
+        changed = _client().patch(
+            "/v1/admin/strategies/active-1",
+            json={"nick": None},
+            headers=_auth("admin-token"),
+        )
+    assert created.status_code == 201
+    assert changed.status_code == 200
+    assert repo.strategies["active-1"].nick == "target_value:base"
+
+
 def test_admin_duplicate_nick_returns_conflict() -> None:
     repo = FakeStrategyRepo()
     with _repos(repo):