Fix Python shell handler exports and logging

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jmoseley

python/copilot/__init__.py

@@ -39,8 +39,11 @@
     SessionEvent,
     SessionListFilter,
     SessionMetadata,
+    ShellExitHandler,
     ShellExitNotification,
+    ShellOutputHandler,
     ShellOutputNotification,
+    ShellOutputStream,
     StopError,
     SubprocessConfig,
     SystemMessageAppendConfig,
@@ -90,8 +93,11 @@
     "SessionEvent",
     "SessionListFilter",
     "SessionMetadata",
+    "ShellExitHandler",
     "ShellExitNotification",
+    "ShellOutputHandler",
     "ShellOutputNotification",
+    "ShellOutputStream",
     "StopError",
     "SYSTEM_PROMPT_SECTIONS",
     "SubprocessConfig",

python/copilot/session.py

@@ -343,8 +343,8 @@ def _dispatch_shell_output(self, notification: ShellOutputNotification) -> None:
         for handler in handlers:
             try:
                 handler(notification)
-            except Exception:
-                pass  # Ignore handler errors
+            except Exception as e:
+                print(f"Error in shell output handler: {e}")
 
     def _dispatch_shell_exit(self, notification: ShellExitNotification) -> None:
         """Dispatch a shell exit notification to all registered handlers."""
@@ -354,8 +354,8 @@ def _dispatch_shell_exit(self, notification: ShellExitNotification) -> None:
         for handler in handlers:
             try:
                 handler(notification)
-            except Exception:
-                pass  # Ignore handler errors
+            except Exception as e:
+                print(f"Error in shell exit handler: {e}")
 
     def _track_shell_process(self, process_id: str) -> None:
         """Track a shell process ID so notifications are routed to this session."""