[render] round 3 NOTES + MODELBEAST work order

Verification numbers, the prod-leak postmortem, and the showroom's contents as
a 23-row asset manifest (asset key / era / footprint) — every row a live
hot-swap target. One contract request (setGhostMode), filed jointly with UI.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

fktry/lanes/LANE-RENDER.md

@@ -282,3 +282,118 @@ building; I loaded it in the dev page and dispatched all 114 commands):
 - Per-era chassis skinning (§8 era skins) once tech/eras land; splitter output lamp
   driven by real round-robin state rather than a timer; bloom-loop belt tell; HF dust
   piles; parity-mite wildlife; LOD/culling if a real megabase ever drags the frame.
+
+### Round 3 — 2026-07-17 — Opus 4.8
+
+**SHIPPED** — all 4 orders, verified in the running build.
+
+1. **Scram from truth.** `SCRAM_RELEASE` and the whole local latch are gone; the
+   renderer reads `EntityState.scrammed`. SIM wired the field mid-round (their
+   `state.scrammed` at index.ts:489/494) so this is verified against their real latch.
+   The crisp test: **heat 0.6 + `scrammed: true` → dead-dark, amber, idle frozen**, and
+   the same heat with `scrammed: false` → alive at body emissive 1.5 (= `1 + 0.6²×1.4`).
+   Same heat, opposite field, opposite visual — no threshold left in this lane to drift.
+   (`e.scrammed ?? heat >= 1` remains only as a bridge for a sim that hasn't set it; it
+   carries no constant.)
+2. **Remove mode.** `setGhost('__remove', …)` → hazard-striped footprint decal + red
+   volume wash (`remove.ts`). Verified through UI's real flow: clicked their REMOVE tab,
+   `selectedBuild()` returned `{def:'__remove',dir:0}`, their hint bar switched to
+   "REMOVE ARMED · LMB DEMOLISH · ESC STAND DOWN", and hovering the mosh reactor lit its
+   **whole 3×3** (decal scale [3,3], wash [2.82,0.8,2.82], centred on the machine at
+   [5.5,9.5] — not the hovered tile). Bare ground shows nothing.
+3. **`?showroom`** — 23 machines + 51 items on labelled plinths, camera preset, and it
+   lands MODELBEAST drops live (hot-swap + normalise + AnimationMixer + era skin all
+   already run through it). See the manifest below.
+4. **Era skins** (`era.ts`) — plumbing, derived from data, verified live.
+
+**VERIFIED**
+- Perf standing rule holds: `?devscene=stress` → 500 entities + 2,000 items at
+  **3.3ms/frame**, 5 instanced draw calls. (R1 3.2 / R2 3.6 / R3 3.3 — topology, heat,
+  mixers, eras and remove-mode have cost nothing measurable.)
+- **Era skins live across all five eras**, each matching its `ERA_SKIN` entry exactly:
+  reel telecine-puller `r0.65/m0.45` (sepia'd to #6e491f), broadcast field-loom
+  `r0.8/m0.1` (phosphor #2e5132), disc mosh-reactor `r0.2/m0.65` (gloss), fortress muxer
+  `r0.95/m0`. **Stream is a true identity skin** — quantizer chassis reads `#5e5148`,
+  byte-for-byte DATA's authored value, so nothing changed for the 16 stream machines.
+- Prod bundle clean: `devscene` 0, `showroom` 0, `plinth` 0, `window.__render` 0 hits
+  (the 4 `__renderTarget` matches are three.js's own).
+
+**DECISIONS**
+- **`BeltItem.id` fallback retired.** Identity is now always the id, which also deleted
+  the per-frame sort of every belt item — the order-matching path only ever existed to
+  reconstruct identity the contract didn't carry.
+- **The showroom fabricates a SimSnapshot** rather than hand-building display meshes, so
+  machines go through the real EntityLayer. A QA page with its own bespoke display path
+  would be testing itself instead of the renderer. Items aren't entities (no `asset`,
+  never hot-swap) so those are built directly — but from beltitems.ts's own factories,
+  so the showroom shows literally what rides the belts.
+- **Camera preset frames the MACHINE hall, not everything.** A view wide enough to hold
+  all 51 items renders every machine too small to judge, which defeats the point. Items
+  are one pan south. Labels are collision-culled front-to-back: ~74 of them cannot all
+  fit at overview zoom, and a readable subset that resolves as you zoom beats a pile.
+- **`__remove` is duplicated, not imported.** A renderer importing UI internals is the
+  wrong layering and there's no contract field yet. Unlike a tuning constant, drift here
+  fails loudly and visibly. Both lanes filed for a real hook (see request 1).
+- Era skin touches the **chassis only** — the accent stays the colour of what the machine
+  makes, because that's the resource, not the decade.
+
+**BLOCKED/BROKEN** — nothing blocking.
+- **A dead debug hook leaked into prod and I nearly shipped it.** Hoisting the scaffold
+  check into a `debug` VARIABLE defeated Rollup's constant folding, so `window.__render
+  = {scene, gl, topo, …}` survived in `dist/` as unreachable dead code (the class itself
+  still tree-shook). Round 2's `if (devSceneEnabled())` folded because the call was
+  inline. Fixed by testing `import.meta.env.DEV` literally at the branch. Flagging the
+  shape, not just the fix: **any** scaffold guard that goes through a variable will do
+  this silently, and only grepping the bundle catches it.
+- Merge pieces still don't route cargo per-inlet (needs `BeltItem.side`, deferred —
+  agreed).
+- The showroom's item hall is laid out for 51 items; if DATA doubles them again the rows
+  will run past the world edge and want paging. Not urgent, noted so it isn't a surprise.
+
+**CONTRACT REQUEST**
+1. **`UIBus.setGhostMode(mode)` or a 4th `setGhost` arg** — LANE-UI filed the same one
+   independently (`src/ui/selection.ts` documents their half). Today remove-mode rides a
+   magic string through `selectedBuild()`, and main.ts fires a `place` for `__remove`
+   every click that the sim discards. It works and it's documented on both sides, but
+   it's a protocol living in two lanes' comments instead of in the contract.
+2. Not urgent: nothing else. v3 granted both of round 2's asks and they both landed
+   clean.
+
+**MODELBEAST WORK ORDER** — this is `?showroom`'s content, and every one of these is a
+live hot-swap target today: drop `public/assets/models/<asset>` and it appears in ~10s,
+no reload, no code. Normalisation means any export scale lands correctly; multi-mesh and
+rigged+animated GLBs both work (verified round 2). Footprint is the tile budget.
+
+| asset | era | fp | machine |
+|---|---|---|---|
+| `asic-cooler.glb` | broadcast | 2x2 | ASIC COOLER |
+| `field-loom.glb` | broadcast | 3x2 | FIELD LOOM |
+| `artifact-bottler.glb` | disc | 2x2 | ARTIFACT BOTTLER |
+| `mosh-reactor.glb` | disc | 3x3 | MOSH REACTOR |
+| `subsampler.glb` | disc | 2x3 | SUBSAMPLER |
+| `muxer.glb` | fortress | 5x5 | THE MUXER |
+| `telecine-puller.glb` | reel | 2x2 | TELECINE PULLER |
+| `belt.glb` | stream | 1x1 | STREAM BELT |
+| `bloom-duplicator.glb` | stream | 1x1 | P-FRAME DUPLICATOR |
+| `buffer-tank.glb` | stream | 2x2 | BUFFER TANK |
+| `dct-press.glb` | stream | 3x3 | DCT PRESS |
+| `decode-asic.glb` | stream | 2x2 | DECODE ASIC |
+| `demosaicer.glb` | stream | 3x2 | DEMOSAICER |
+| `demuxer.glb` | stream | 2x2 | DEMUXER |
+| `gop-assembler.glb` | stream | 3x2 | GOP ASSEMBLER |
+| `hex-splicer.glb` | stream | 3x3 | HEX SPLICER |
+| `lane-splitter.glb` | stream | 1x1 | LANE SPLITTER |
+| `mv-extractor.glb` | stream | 2x2 | MV EXTRACTOR |
+| `p-caster.glb` | stream | 2x2 | P-CASTER |
+| `quantizer.glb` | stream | 2x2 | QUANTIZER |
+| `seam-extractor.glb` | stream | 2x2 | SEAM EXTRACTOR |
+| `shipper.glb` | stream | 2x2 | SCREEN UPLINK |
+| `software-decoder.glb` | stream | 2x2 | SOFTWARE DECODER |
+
+Hero assets worth `fal_trellis2` (codex §9): `muxer` (5x5, the rocket), `mosh-reactor`,
+plus the Fortress kit when it exists. Everything else is `sf3d` territory.
+
+**NEXT (round 4 candidates, not self-assigned)**
+- Real MODELBEAST assets through `?showroom`; splitter lamp driven by real round-robin
+  state instead of a timer; bloom-loop belt tell; HF dust piles; wildlife; save/load
+  camera state; LOD/culling if a megabase ever drags the frame.