Fix: always speak name after enrollment, even when face save fails

The enrollment loop was catching only ValueError, but add_face can also
raise OSError (from save()), onnxruntime errors, or numpy exceptions.
Any of those caused the exception to propagate past the loop, skipping
the speak("Nice to meet you, {name}!") call entirely.

Broadened the catch to Exception so that enrollment frame failures are
logged at DEBUG level but never prevent the robot from greeting the user.

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

recognizer/main.py

@@ -177,8 +177,8 @@ class Recognizer(ReachyMiniApp):
                         try:
                             add_face(name, ef, face_db)
                             enrolled += 1
-                        except ValueError:
-                            pass
+                        except Exception as exc:
+                            logger.debug("Enrollment frame skipped: %s", exc)
                     if enrolled == 0:
                         logger.warning("Enrollment failed: no face detected in captured frames")
                     enrollment_frames.clear()