add uses lightsabre property to backend and release 2.10.3 (#2063)

* add uses lightsabre property to backend

* Update pytket/pytket/backends/backend.py

Co-authored-by: Dan Mills <52407433+daniel-mills-cqc@users.noreply.github.com>

* update changelog

---------

Co-authored-by: Dan Mills <52407433+daniel-mills-cqc@users.noreply.github.com>

Author: cqc-melf

pytket/docs/changelog.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 2.10.3 (October 2025)
+
+- Add `tket_squash_phasedx_rz` to c api.
+
 ## 2.10.2 (October 2025)
 
 Fixes:

pytket/pytket/backends/backend.py

@@ -95,6 +95,11 @@ def valid_circuit(self, circuit: Circuit) -> bool:
         """
         return all(pred.verify(circuit) for pred in self.required_predicates)
 
+    @property
+    def _uses_lightsabre(self) -> bool:
+        # lightsaber is a routing method used by pytket-qiskit
+        return False
+
     def _check_all_circuits(
         self, circuits: Iterable[Circuit], nomeasure_warn: bool | None = None
     ) -> bool: