fix: preserve adaptive IVF probe defaults (#4168)

Keep IVF probe fields unset by default so Lance supplies adaptive
behavior. Preserve `nprobes`, `minimum_nprobes`, and `maximum_nprobes`
independently through Rust, Python, namespace, and remote request
construction, with compatibility fields serialized only when explicitly
configured.

The final Rust namespace and LSM propagation update depends on the Lance
release containing lance-format/lance#9184.

python/python/tests/test_hybrid_query.py

@@ -355,6 +355,20 @@ def test_hybrid_query_minimum_nprobes_zero_raises(sync_table: Table):
         )
 
 
+def test_hybrid_query_nprobes_remains_independent(sync_table: Table):
+    query = sync_table.search(query_type="hybrid").nprobes(20)
+
+    assert query._nprobes == 20
+    assert query._minimum_nprobes is None
+    assert query._maximum_nprobes is None
+
+    query = query.minimum_nprobes(5).nprobes(20)
+
+    assert query._nprobes == 20
+    assert query._minimum_nprobes == 5
+    assert query._maximum_nprobes is None
+
+
 def test_hybrid_query_distance_range(sync_table: Table):
     reranker = RRFReranker(return_score="all")
     result = (