M1: build shared 2-tread bot; rewire TreadPart to seat-based gating

- Rewrote TreadPart: seat-based input gating (was mis-wired to NetworkObject
  IsOwner, which needs per-tread ownership that NGO forbids for nested
  NetworkObjects). Both treads now share the chassis NetworkObject; a client
  drives the tread whose SeatManager seat it holds, host re-validates OwnsSeat
  on a RequireOwnership=false RPC. Also swapped to Keyboard.current (New input).
- Moved SeatManager OnGUI below the connectivity panel (was overlapping).
- M1_Arena: in-scene Bot NetworkObject = chassis (Rigidbody 60kg + NetworkObject
  + NetworkTransform + NetworkRigidbody + SeatManager) + Tread_L/Tread_R children
  (TreadPart, world offset +/-1.2 X for differential drive).
- Solo-verified: bot auto-spawns in-scene, seat claim + input gating wired.

Controls: W/Up throttle, Shift pivot, A/D lean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

memory.md

@@ -16,6 +16,8 @@ Durable memory for this project. Read at session start, update before session en
 ## Open questions / TODOs
 
 - [ ] **▶ M1 IN PROGRESS** (see `docs/prototype-plan.md`). Done so far (2026-07-10, all compiling clean + pushed): **packages** (NGO 2.13.0 + `com.unity.services.multiplayer` 2.2.4 — the *unified* SDK that supersedes the deprecated standalone relay/lobby packages; pulls transport 6.5.0 + core/auth), **4 scripts** in `Assets/Scripts/{Net,Bot}/`, **scene** `Assets/Scenes/M1_Arena.unity` (NetworkManager+UnityTransport+NetworkBootstrap, ground/cam/light, set as build scene), **replicated Player capsule prefab** (`Assets/Prefabs/Player.prefab`, registered as `NetworkConfig.PlayerPrefab`).
+  - **✅ CAPSULE REPLICATION VERIFIED (2026-07-11) — M1 netcode thesis proven.** Two clients over Relay (host = original editor via MCP, client = ParrelSync clone), both capsules spawned + drove independently + replicated **bidirectionally, smooth**. The `input→ServerRpc→host-physics→NetworkTransform` loop works over real Relay. **ParrelSync 1.5.2** installed for local 2-client testing (clone at `../jankenbots_clone_0`, symlinks Assets+ProjectSettings; open it via `ClonesManager.OpenProject` or the ParrelSync menu; its MCP loses the port fight so only the original is MCP-controllable).
+  - **✅ SHARED BOT BUILT (2026-07-11), solo-smoke-verified; awaiting 2-pilot drive test.** In-scene `Bot` NetworkObject in M1_Arena: chassis Cube (Rigidbody 60kg + NetworkObject + NetworkTransform + NetworkRigidbody + SeatManager) with two child treads `Tread_L`/`Tread_R` (TreadPart, side Left/Right) at world ±1.2 X. In-scene bot auto-spawns on host; seat claim + gating verified solo. **DESIGN FIX (important):** the two drafts were mis-wired — TreadPart gated on NetworkObject `IsOwner` (needs per-tread ownership → impossible, NGO forbids nested NetworkObjects in a spawned prefab) while SeatManager's `OwnsSeat/PilotOf` API sat unused. Rewrote TreadPart to **seat-based gating**: both treads share the chassis NetworkObject; a client drives the tread whose seat it holds (`PilotOf(side)==LocalClientId`), host re-validates `OwnsSeat` on the RequireOwnership=false RPC. Also swapped TreadPart to `Keyboard.current` (New-only input). Controls: **W/↑ throttle · Shift pivot · A/D lean**. Moved SeatManager OnGUI below the bootstrap panel (was overlapping).
   - **✅ UGS GATE CLEARED + HOST PATH VERIFIED (2026-07-10).** Cloud project **jankenbots** (`cloudProjectId a0d222ae-c79b-4120-bc0d-947bfd7600cb`, org `megaproxy`) is linked (has been in ProjectSettings since project creation) AND **Relay is now activated in the dashboard** (the missing step — done via cloud.unity.com ▸ Development ▸ Products ▸ Relay; there is NO enable toggle, opening the product page activates it). Verified by an in-editor Play-mode smoke test: `UnityServices.State=Initialized`, anonymous auth signed in, `HostGame()` created a real Relay allocation + join code, host's Player capsule auto-spawned (`IsSpawned`, owner=0). **The host half of M1-step-2 works end-to-end.** Still unverified: a *remote client joining* + peer-to-peer replication (needs a 2nd instance — standalone build via `manage_build` or a ParrelSync clone).
   - **Next build steps:** (5) shared bot = chassis Rigidbody + 2 `TreadPart` treads + `SeatManager` (⚠ `TreadPart` still reads legacy `Input.GetAxis` — swap to `Keyboard.current` like PlayerDriver was, project is Input-System-**New-only**); (6) shove ball + follow cam; (7) 2-friends feel test over Relay (needs a standalone build via `manage_build` or a ParrelSync clone for the 2nd client).
   - **Verified Relay API gotcha (baked into NetworkBootstrap):** with the unified SDK, `new RelayServerData(allocation, "dtls")` does NOT exist — use `AllocationUtils.ToRelayServerData(allocation, "dtls")` (`AllocationUtils` is in `Unity.Services.Relay.Models`). Corrected via live editor reflection.