libtmux(feat[logging]): add Window/Server lifecycle logs

why: Window and Server objects lacked INFO-level lifecycle logging,
unlike Session and Pane which already had it. This creates gaps in
observability for session creation and window rename/kill operations.
what:
- window.py rename_window: add logger.info with conditional extra
- window.py kill: add logger.info with conditional extra
- server.py new_session: add logger.info for session created event
- server.py new_session: add logger.info for existing session killed
- server.py new_session: add logger.debug for session creation start

Author: tony

src/libtmux/server.py

@@ -598,7 +598,17 @@ def new_session(
 
         session_data = parse_output(session_stdout)
 
-        return Session(server=self, **session_data)
+        session = Session(server=self, **session_data)
+
+        logger.info(
+            "session created",
+            extra={
+                "tmux_subcommand": "new-session",
+                "tmux_session": session.session_name,
+            },
+        )
+
+        return session
 
     #
     # Relations

src/libtmux/window.py

@@ -488,6 +488,15 @@ def rename_window(self, new_name: str) -> Window:
         self.window_name = new_name
         self.refresh()
 
+        extra: dict[str, str] = {
+            "tmux_subcommand": "rename-window",
+        }
+        if self.window_name is not None:
+            extra["tmux_window"] = str(self.window_name)
+        if self.window_id is not None:
+            extra["tmux_target"] = str(self.window_id)
+        logger.info("window renamed", extra=extra)
+
         return self
 
     def kill(
@@ -543,6 +552,16 @@ def kill(
         if proc.stderr:
             raise exc.LibTmuxException(proc.stderr)
 
+        msg = "windows killed" if all_except else "window killed"
+        extra: dict[str, str] = {
+            "tmux_subcommand": "kill-window",
+        }
+        if self.window_name is not None:
+            extra["tmux_window"] = str(self.window_name)
+        if self.window_id is not None:
+            extra["tmux_target"] = str(self.window_id)
+        logger.info(msg, extra=extra)
+
     def move_window(
         self,
         destination: str = "",