docs: multi-client free team, free broom, multi-path e2e list

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

README.md

@@ -1,6 +1,6 @@
 ## curltastic
 
-A 1v1 async multiplayer 2D curling game for mobile browser.
+A multiplayer 2D curling game for mobile browser. Any number of clients can join a room, pick Red or Yellow freely, and throw when it is that team's turn (solo pass-and-play or remote opponents).
 
 - **Backend** — Rust, Axum, WebSocket, Rapier2D physics (server-authoritative, 120 Hz).
 - **Frontend** — TypeScript, Vite, Canvas2D, portrait-first touch UI.
@@ -33,12 +33,12 @@ The frontend binds to `0.0.0.0` via `--host`. Find your machine's LAN IP and ope
 
 ### Controls
 
-- Drag inside the house to place the broom (aim point).
-- Use the team dropdown to choose which team's stone you are throwing.
-- Use the left/right arrow buttons to select curl; the arrow points the direction the stone will curve.
-- Tap **THROW**.
-- The server runs the physics for every stone and streams their paths; the frontend interpolates the animation, so collisions animate smoothly for all stones.
-- Drag anywhere outside the house (or when it's not your turn) to scroll up toward the hog line.
+- When it is your team's turn, drag on the sheet to place the broom (aim point) — aim is not limited to the house.
+- When it is not your turn, drag to pan the ice (default framing shows the house with sidelines; pan up toward the hog line).
+- Use the team dropdown to choose which team's stone you are throwing; switch any time (including mid-end for solo play).
+- Use the left/right curl buttons and the weight/friction controls; friction is a local scalar.
+- Tap **THROW**. Anyone identifying as the turn team may throw.
+- The server runs physics for every stone and streams multi-stone paths; the client animates them on one clock so collisions move together.
 
 ### Architecture
 
@@ -54,9 +54,12 @@ With the backend and frontend dev server running:
 ```bash
 cd e2e
 npm install -g ws   # or npm install ws locally in the project
-node e2e_test.cjs   # room lifecycle, throw, trajectory, out-of-play removal
-node e2e_score.cjs  # stones remain in play and alternate turns
-node collision_trajectory_qa.cjs  # verifies every stone gets a trajectory during a collision
+node e2e_test.cjs              # room lifecycle, throw, trajectory
+node e2e_score.cjs             # alternate turns / stones in play
+node e2e_persistence.cjs       # multi-throw stone persistence
+node e2e_multi_client.cjs      # 3 clients share state (no room-full)
+node e2e_end_score.cjs         # full end → end_scored + next end
+node collision_trajectory_qa.cjs  # multi-stone trajectory on collision
 ```
 
 ### Limitations / known simplifications