test: drop archived bug-ancestor-auto-advance@1 from state-tx/CP_URL discovery sets

Template moved to _archived/ (c7da48d7); glob discovery no longer sees it.

Claude-Session: https://claude.ai/code/session_01N218bERyNeLhbLmDRDvbWF

tests/invariants/test_state_tx_runtime_env.py

@@ -32,8 +32,8 @@ def test_state_tx_templates_discovered():
     assert {
         "test-validate@1.yaml",
         "frozen-fixture-emit@1.yaml",
-        "bug-ancestor-auto-advance@1.yaml",
     } <= set(_NAMES)
+    assert "bug-ancestor-auto-advance@1.yaml" not in _NAMES  # archived (WT-ANC-15)
 
 
 @pytest.mark.parametrize("name", _NAMES)
@@ -93,7 +93,6 @@ def test_cp_url_templates_discovered():
     assert {
         "test-validate@1.yaml",
         "frozen-fixture-emit@1.yaml",
-        "bug-ancestor-auto-advance@1.yaml",
         "scope-decompose-sonnet@1.yaml",
         "scope-decompose-sonnet@2.yaml",
         "bug-verify-sonnet@1.yaml",