some fixes again

python_app/orchestration/shm/ring_writer.py

@@ -72,7 +72,6 @@ class ShmRingWriter:
             self._mmap.close()
             self._file.close()
             self._unlink_if_present()
-            created = not self._path.exists()
             fd = os.open(self._path, os.O_RDWR | os.O_CREAT, 0o660)
             self._file = os.fdopen(fd, "r+b", buffering=0)
             self._file.truncate(self._mapped_size)
@@ -135,23 +134,11 @@ class ShmRingWriter:
         self._write_u64(32, 0)
         self._write_u64(40, 0)
 
-    def _validate_header(self) -> None:
-        magic = self._mmap[:8]
-        version = self._read_u32(8)
-        capacity = self._read_u32(12)
-        slot_size_bytes = self._read_u32(16)
-        if magic != _MAGIC:
-            raise RuntimeError(f"Shared memory ring magic mismatch for {self._ring_name}")
-        if version != _VERSION:
-            raise RuntimeError(f"Shared memory ring version mismatch for {self._ring_name}")
-        if capacity != self._capacity or slot_size_bytes != self._slot_size_bytes:
-            raise RuntimeError(f"Shared memory ring geometry mismatch for {self._ring_name}")
-
     def _header_matches(self) -> bool:
         """Return whether the existing segment's header matches this ring's geometry.
 
-        Non-throwing counterpart of `_validate_header` used by the owner to decide
-        whether a same-sized pre-existing segment can be reused or must be recreated.
+        Used by the owner to decide whether a same-sized pre-existing segment can be
+        reused as-is or must be unlinked and recreated.
         """
         return (
             self._mmap[:8] == _MAGIC