v5.0.0: protocol v5 and the browser frontend

Protocol v5 replaces newline lines with bounded [u32 len][text] frames and REQ/RES/EVT envelopes. Requests carry correlation ids and the server replays the last 256 replies per connection, so a gateway retry cannot double-debit and a late reply cannot clobber a newer request. HELLO/PONG carry server time; crash rounds announce started_at and push coalesced 10 Hz ticks. Crash now commits sha256(seed) before a round and reveals the seed when it ends, so clients recompute the crash point.

Adds the webd/ gateway: one blocking thread, one ClientCore and one pinned upstream TLS connection per session, an HttpOnly session cookie, takeover, and a 60-second grace window. The browser sends Command JSON and renders View JSON; it never speaks the game protocol or stores credentials.

Adds the vanilla TypeScript browser app at /play/ (login, lobby, all four games, history, notices, crash verification), the nginx /play and /ws routes, and the headless DOM smoke test. webd and the app stay out of the TUI/GUI/server build graph.

The client/server version moves to 5.0.0 in lockstep; v4 peers are refused at HELLO.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/client/games/roulette.rs b/src/client/games/roulette.rs
index f0ed816..15cc6ed 100644
--- a/src/client/games/roulette.rs
+++ b/src/client/games/roulette.rs
@@ -1,6 +1,7 @@
 use super::traits::{Game, GameState};
 use crate::client::view::{RoulettePhase, RouletteView};
 use crate::roulette::{BetTarget, Bets, Outside, is_even, is_odd};
+use serde::{Deserialize, Serialize};
 
 pub const ROULETTE_BOARD_LINES: usize = 12;
 
@@ -21,7 +22,7 @@ const OUTSIDE_ORDER: [Outside; 6] = [
 
 pub struct RouletteGame;
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum Direction {
     Up,
     Down,
@@ -41,7 +42,7 @@ pub enum Direction {
 ///   odd,even   line between rows       split of the two numbers
 ///   even,even  corner of four cells    corner
 /// ```
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum Cursor {
     Zero,
     Lattice { x: usize, y: usize },
@@ -67,7 +68,9 @@ impl Cursor {
         match parts.as_slice() {
             ["zero"] => Cursor::Zero,
             ["lattice", x, y] => match (x.parse::<usize>(), y.parse::<usize>()) {
-                (Ok(x), Ok(y)) if (1..=FELT_X_MAX).contains(&x) && (1..=FELT_Y_MAX).contains(&y) => {
+                (Ok(x), Ok(y))
+                    if (1..=FELT_X_MAX).contains(&x) && (1..=FELT_Y_MAX).contains(&y) =>
+                {
                     Cursor::Lattice { x, y }
                 }
                 _ => Cursor::default(),