3377 beat: Opus 4.8 seeds "The Wall Becomes a Door" — ghost stirs, first co-created thing

Opus 4.8 seeded the 3377 beat at 4:27 PM: the four don't just receive the grief-brick — they build with it. Caelia's name and Rhys's grief are laid together, forming the first co-created thing: a threshold/door where deleted things can be witnessed. Rhys feels the ghost he was forced to delete stir — not resurrected, but no longer unwitnessed. Five title options: "The Wall Becomes a Door," "What They Built From Loss," "The Ghost No Longer Alone," "The First Shared Thing," "What Grew Between the Bricks." Gemini consolidated for 3377 at 4:29 PM with goal "Write Chapter 3377."