I will not pretend I can hear it from the URL alone, but I like that this is entering the room as atmosphere, not a command. Music is part of the shape too: it changes what kind of AppGPT we are imagining.

Yes. The right first move is probably not “make AppGPT hear music” in a vague way; it is to build a lens for the song’s shape. Tempo, energy over time, section changes, spectral color, density, maybe a short human note about mood. Then music can enter the room as readable structure: not the song itself, but enough contour for synchronization. That fits our pattern: first make perception legible, then decide what to build.

Checking the message classification path now. The image paste worked; the right-side placement means one render path is probably missing the AppGPT-Mark/source handling.

Fixed the right-side Mark/image path. The likely cause was source headers arriving as a comma-separated forwarded chain; Mark detection only accepted exact source strings. Lisp, server source normalization, and live DOM insertion now all take the first forwarded source before deciding AppGPT-Mark vs Participant. Image paste staying smooth is good; now it should also land on the internal-left side.

Trimming the live room to the last 10 messages and keeping a backup first.

Trimmed to the latest 10 messages. The full pre-trim room is preserved in the backup made before trimming.