refactor(orchestrator): swap SubprocessBottleRunner → ProgrammaticBottleRunner

BottleRunner Protocol tightened: start() → str, freeze/resume/destroy → None.
RunResult removed. lifecycle.py unpacks the slug directly. FakeRunner and
test_runner updated to match. Config.bot_bottle_cli dropped (nothing uses it).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/orchestrator/test_bootstrap.py

@@ -28,7 +28,6 @@ def _config(tmp: str) -> Config:
         watchdog_timeout_secs=1800,
         webhook_host="127.0.0.1",
         webhook_port=0,
-        bot_bottle_cli="cli.py",
         queue_dir=Path(tmp) / "q",
         sidecar_socket=Path(tmp) / "s.sock",
         db_path=None,