Hover a visible cell to preview its trace state. Click to pin; click the same cell, empty canvas, ×, or Escape to unselect. A pinned coordinate remains selected while stepping, even if it becomes empty.

Port 0 is always the principal (▸): producers emit their value there, consumers consume there, and a fire needs the two principals facing across one edge. Aux ports carry everything else. On the canvas a white triangle marks the principal face, a hollow circle marks aux 1, and a diamond marks aux 2. When both auxiliaries use one face, their markers sit side-by-side over that edge's two lanes. Producers use four-sided diamonds; consumers use six-sided faceted diamonds.

consumer principal ↔ principal producer ⇒ fresh agents (the dying pair's external wires resplice per the ROM's wiring permutation). Gold = firing in the frame you are on; ×n = firings in this trace (dimmed = never fires here); click a rule to jump to its next firing.

bold white stub + white triangle = principal port; hollow circle = aux 1; diamond = aux 2; tag name sits beside the body (v toggles all canvas text)
route color keys on its index inside the cell (route 1 / 2 / 3) — routes run straight, or bend once around the cell corner between their two faces; overlapping strands nest on parallel offset lanes; numbered labels match the inspector's s1/s2/s3; gold halo = hot (demanded) lane
red glow = χ pressure field
colored square outline = rewrite in progress — gold seed (docked pair), green builder cursor, orange seed+cursor sharing a cell
dashed cyan ring + dimmed body = nursery agent: placed by the cursor, inert until the seed resolves
white rings + cross = this generation's wavefront (every cell that committed); dashed white rings = the next generation's front
gold event ring = semantic fire (rule shown); far cells dim with camera depth (q/e yaw, r/f pitch)

Each scenario records one run generation by generation: frame 0 is a full keyframe, later frames are literal one-cell deltas plus the front's commit and fire events. Docked principal pairs become a two-cell seed; a builder cursor grows the rule's blocklet as nursery matter, resolves the fire while every fresh agent is still seated, then finalizes. At quiescence the lattice is projected onto the shadow interaction net and checked port-for-port. A parked trace is incomplete, never wrong: the run wedged with its seed still visible. The viewer only replays.