fix: drop _file_handler's unused name parameter

leftover from the v0.5.0 history-namespace split - every path inside
_file_handler already uses live_path/history_stem/log_dir, never name. the
docstring still explained it as "the LIVE stem" though nothing read it.

Signed-off-by: disqualifier <dev@disqualifier.me>

src/log_setup/setup.py

@@ -144,14 +144,14 @@ def _history_stem() -> str:
 
 
 def _file_handler(
-    name: str, history_stem: str, live_path: str, log_dir: str, rotate: Optional[str],
+    history_stem: str, live_path: str, log_dir: str, rotate: Optional[str],
     backup_count: int, max_bytes: int, compress: bool,
     keep_uncompressed: Optional[int], keep_compressed: Optional[int], warnings: list,
 ) -> logging.Handler:
     """build the configured file handler with custom rolling into log_dir
 
-    `name` is the LIVE stem; `history_stem` is the PROJECT stem that rolled/historic
-    files are named off, decoupled from the live file's own name.
+    `history_stem` is the PROJECT stem that rolled/historic files are named off,
+    decoupled from the live file's own name (`live_path`).
     """
     tiered = keep_uncompressed is not None or keep_compressed is not None
     if rotate == "size":
@@ -285,7 +285,7 @@ def setup_logging(
     if file_ok:
         try:
             fh = _file_handler(
-                stem, history_stem, live_path, log_dir, rotate, backup_count, max_bytes, compress,
+                history_stem, live_path, log_dir, rotate, backup_count, max_bytes, compress,
                 keep_uncompressed, keep_compressed, warnings,
             )
             fh.setFormatter(formatter)