Make kernel_cache_hit property private.

Author: lohedges

src/loch/_sampler.py

@@ -760,16 +760,8 @@ def pop(self) -> None:
         self._backend.pop_context()
 
     @property
-    def kernel_cache_hit(self) -> bool:
-        """
-        Whether kernel compilation was satisfied from cache.
-
-        Returns
-        -------
-
-        cache_hit: bool
-            True if kernels were loaded from cache, False if freshly compiled.
-        """
+    def _kernel_cache_hit(self) -> bool:
+        """Whether kernel compilation was satisfied from cache."""
         return self._backend.cache_hit
 
     def system(self) -> _Any:

tests/test_energy.py

@@ -429,8 +429,8 @@ def _create_and_run(seed):
     sampler2 = _create_and_run(seed=42)
 
     # Verify cache behaviour.
-    assert not sampler1.kernel_cache_hit, "First sampler should compile from source"
-    assert sampler2.kernel_cache_hit, "Second sampler should use cached kernels"
+    assert not sampler1._kernel_cache_hit, "First sampler should compile from source"
+    assert sampler2._kernel_cache_hit, "Second sampler should use cached kernels"
 
     # Verify energy consistency.
     energy1_coul = sampler1._debug["energy_coul"]