feat: make send_profile opt-in CLI flag, add magic-wormhole as regular dep

Profiling data is no longer auto-sent via wormhole after every recording.
Use --send_profile flag to opt in. Also promotes magic-wormhole from
optional [share] extra to a regular dependency since sharing is core
functionality.

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

Author: abrichr

openadapt_capture/recorder.py

@@ -1820,8 +1820,9 @@ def join_tasks(task_names: list[str]) -> None:
               f"FPS={config.SCREEN_CAPTURE_FPS}")
         print("=========================\n")
 
-        # Auto-send profiling via wormhole
-        _send_profiling_via_wormhole(_profile_path)
+        # Auto-send profiling via wormhole if requested
+        if send_profile:
+            _send_profiling_via_wormhole(_profile_path)
     except Exception as exc:
         logger.warning(f"Profiling save/send failed: {exc}")