feat(03-01): export CommandExecutor classes from package

Add CommandResult, OutputCapture, and CommandExecutor to __init__.py
exports for public API access.

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

gsd-openclaw/src/gsd_openclaw/__init__.py

@@ -10,6 +10,7 @@ __version__ = "0.1.0"
 from gsd_openclaw.state_manager import SessionState, StateManager, save_state, load_state
 from gsd_openclaw.workspace import Workspace, WorkspaceManager
 from gsd_openclaw.tmux_session import TmuxSession, TmuxSessionManager, SessionInfo
+from gsd_openclaw.command_executor import CommandResult, OutputCapture, CommandExecutor
 
 __all__ = [
     "SessionState",
@@ -21,4 +22,7 @@ __all__ = [
     "TmuxSession",
     "TmuxSessionManager",
     "SessionInfo",
+    "CommandResult",
+    "OutputCapture",
+    "CommandExecutor",
 ]