# LANE D — Update for Fable

## This phase: The Headshell Workshop ✅

Of the two briefs, **WORKSHOP_CARTRIDGE is Lane D's** (stylus node, tonearm,
interaction, quest). GLOWUP_ART is Lane A/C (atlas, bloom, decals, mixer density,
PCB pagodas) — untouched by me, and I deliberately kept out of
`worldgen/buildBooth.ts` so that lane keeps the file conflict-free.

**Status: complete, implemented exactly as briefed, verified live (incl. two-tab
sync and a relay fuzz). `npm run typecheck` clean, zero console errors.**

Full wiring + contract additions: [INTEGRATION_NOTES.md](./INTEGRATION_NOTES.md)
§ "Headshell Workshop".

### What landed

New `src/machines/workshop/**` — one `Workshop` machine (on `machines.workshop`)
owning the visible/collidable assembly arm. The real `Tonearm` sits in **service
mode** until `stylus` is repaired, then takes back over (cue/track/return).

| Stage | Mechanic |
|---|---|
| 1 Seat | Parts-bin chrome pickup = the cartridge. Seats **rotated wrong** (1–3); E cycles it square — the needle tip glints when correct. |
| 2 Wires | Pick a tag-wire off the loom → it trails as a **catenary** from your hand; **hold E 1.2 s** to crimp onto a stubborn pin. Any wire fits any pin; a 4-LED **continuity lamp** tells the truth. Carrying halves your jump; Q or walking >30 voxels returns it. |
| 3 Screws | **Hold E** to torque (2.5 s, radial HUD meter), **Shift+hold E** backs off. Uneven → the cart visibly tilts → azimuth error. |
| 4 Balance | Cue lever lifts the arm into a **live seesaw you stand on**; shove the counterweight (fader-style walk-push, 11 notches). Bubble level centres at 7; 8 = 2 g. |
| 5 Drop | Cue again → test signal. Every mistake you left in is **heard** and drawn as a glyph on the scope block. All clean → `quest.repair('stylus')` and the arm becomes the normal tonearm. |

Nothing hard-fails: a bad test drops you back to `clip` with every stage
revisitable. All state syncs, so **two players can split the job**.

### Verified live (not just typecheck)

- **Happy path** through the real press/hold/cue API → repairs `stylus`, tonearm
  restored, quest 1/5.
- **All fault modes** classify + announce: skate, swapLR, phaseCancel,
  azimuthTilt, trackingLight, trackingHeavy, plus `incomplete` for a wire left
  off. Combined faults surface together. A failed test never repairs.
- **Seesaw (the risky one)**: standing on the beam while sweeping the notch —
  player motion ≤ **0.075 voxels/tick**, zero drift, finite, at **33 and
  stopped**. No slingshot. (Lane B's min-penetration resolution handles it.)
- **Two tabs**: A crimped wires while B torqued screws → converged both ways; a
  third late joiner got the **completed pose**.
- **Relay fuzz**: 17 malformed shapes dropped, state uncorrupted, no crash; valid
  messages still accepted.

### Two things worth your call

1. **`trackingHeavy` platter sag** — the brief wants the platter to visibly drag
   −15%. I shipped the audio lowpass only: a visible sag needs a method on
   `Platter`, and `platter.ts` isn't in this brief's sanctioned edit list. Say the
   word and it's a 5-line additive method.
2. **Relay last-write-wins has no re-sync.** A dropped message (e.g. the 40 msg/s
   cap during a burst) leaves clients diverged until the next change. Real pacing
   is ~8/s so it doesn't bite, and it's inherent to the existing edit/platter
   design too — but a periodic state heartbeat would close it if you want it
   airtight.

### Notes on the other briefs / backlog

- The **Glow-Up** brief is not mine, but it and this one are disjoint by design —
  I render all workshop meshes myself, so no `buildBooth.ts` contention.
- Of your backlog, **emotes** and the **booth-reset ritual** are Lane D-shaped
  (machines/interaction/quest). The reset ritual is a nice inverse of this work:
  mining the fuse back out would need `Quest` to support un-repair + a
  `signal:break` event — happy to brief/build it.

---

### Repo state

The workshop code is already committed on `main` (`9c668d3`). My only uncommitted
changes are docs: this file and the INTEGRATION_NOTES verification section — I
haven't pushed to `ssh://git@100.71.119.27:222/monster/TURNCRAFT.git`, since the
booth is shared and live and anything I push syncs to everyone. Say go and I'll
push.

Local test artifacts cleaned up (relay + dev server stopped,
`server/booth-state.json` removed).