feat: emit OSC terminal notifications on agent turn completion

Emit OSC 9 and OSC 777 escape sequences when the agent completes
a turn, enabling desktop notifications in supported terminals
(iTerm2, Windows Terminal, GNOME Terminal, rxvt-unicode, etc.).

Only emits when stdout is a TTY to avoid noise in piped/redirected
output.

Fixes #1342

Author: Br1an67

src/kimi_cli/ui/shell/visualize.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import sys
 from collections import deque
 from collections.abc import Awaitable, Callable
 from contextlib import asynccontextmanager, suppress
@@ -444,6 +445,17 @@ async def _keyboard():
         await listener.stop()
 
 
+def _emit_osc_notification(title: str, body: str) -> None:
+    """Emit terminal notification via OSC 9 and OSC 777."""
+    if not sys.stdout.isatty():
+        return
+    # OSC 9: used by ConEmu, Windows Terminal, iTerm2
+    sys.stdout.write(f"\x1b]9;{body}\x07")
+    # OSC 777: used by rxvt-unicode, VTE-based terminals (GNOME Terminal, etc.)
+    sys.stdout.write(f"\x1b]777;notify;{title};{body}\x07")
+    sys.stdout.flush()
+
+
 class _LiveView:
     def __init__(self, initial_status: StatusUpdate, cancel_event: asyncio.Event | None = None):
         self._cancel_event = cancel_event
@@ -568,7 +580,7 @@ def dispatch_wire_message(self, msg: WireMessage) -> None:
                     )
                 )
             case TurnEnd():
-                pass
+                _emit_osc_notification("Kimi", "Task completed")
             case CompactionBegin():
                 self._compacting_spinner = Spinner("balloon", "Compacting...")
                 self.refresh_soon()