add-cartridge-model

ACTIVE BUILD

Rigor: architecture

Why

Named modes already pick one extra and unload the rest. The operator wants to slot models and plugins like game carts. Without a catalog of costs and shelves, a packer cannot refuse an illegal seat, and /bay cannot draw the board.

What

• ADD capability cartridge-runtime
• Catalog JSON: id, kind (model|plugin), shelf, costs per box, exclusive tags
• Named modes are preset arrays of cartridge ids
• Envelope id parameterizes the pack target (live brick vs T4000 second scale)
• Names from web3d-space MODELS.md / MODES.md; 3090 FACT costs from this repo

Impact

• Capabilities: ADDED cartridge-runtime
• ADRs: none yet (shape is a catalog + later packer; ARCHITECTURE.md still empty)

User journey & surfaces

No new UI because the slot board is add-cartridge-glass on /bay. This change is the catalog contract the packer and glass will read. A filmmaker on /bay later seats a cart; bounce is add-cartridge-pack.

Out of scope

• Binpacker algorithm (add-cartridge-pack)
• 3090 loader (add-3090-cartridge-load)
• Slot-board glass (add-cartridge-glass)
• Qwen3.5-9B install on fractal1
• Forking product ground out of web3d-space MODELS.md / MODES.md