Harden core mechanics with live playtest and quarantine coverage

README.md

@@ -185,10 +185,12 @@ forwarding and controls.
    ```
 
    Player counts from 2 through 500 are supported. Counts above eight use one-cell high-scale spawns, a compact HUD summary, and selective local tactical subscriptions. Other presets are `dev64` and
-   `validation192`. Lobby configuration is one-shot: the first successful
-   `configure_match` or `configure_map` locks it against further regeneration
-   without claiming a player slot. Every configured slot remains open for a
-   normal `join_match` call. The compatibility reducer `configure_map` changes
+   `validation192`. The first successful `configure_match` or `configure_map`
+   records the calling identity and locks configuration against every other
+   identity without claiming a player slot; the recorded configurator may still
+   reconfigure until the first player joins. Every configured slot remains open
+   for a normal `join_match` call (fresh slot claims are lobby-only; reconnects
+   work in any phase). The compatibility reducer `configure_map` changes
    only the preset while retaining the currently configured player count:
 
    ```bash
@@ -394,6 +396,16 @@ load is distributed; simulation is not).
 - `modules/match` — authoritative SpacetimeDB schema, reducers, and scheduler.
 - `tools/mapgen` — curated map generator/validator CLI.
 - `tools/match-e2e` — real-server two-client acceptance smoke test.
+- `tools/match-playtest` — automated no-human cluster-controls live playtest
+  (six behavioral scenarios + conservation monitor). One command:
+
+```bash
+./scripts/run-automated-playtest.sh
+```
+
+This publishes a fresh isolated `of-match-e2e-auto` database (never
+`of-match-dev`) and writes evidence to `docs/playtests/` and
+`artifacts/playtests/`.
 - `tools/match-perf` — distributed-capable live-match load driver and step-rate profiler.
 - `docs` — the game design, architecture, UI direction, implementation notes,
   performance profiling, and deliberately deferred ideas.

crates/game-client/src/hud.rs

@@ -1,3 +1,5 @@
+#[cfg(not(target_arch = "wasm32"))]
+use bevy::app::AppExit;
 use bevy::{
     picking::hover::Hovered,
     prelude::*,
@@ -7,9 +9,6 @@ use bevy::{
     },
 };
 
-#[cfg(not(target_arch = "wasm32"))]
-use bevy::app::AppExit;
-
 use crate::{
     interaction::{InteractionState, OrderMode},
     map_view::map_view_status_bundle,

crates/game-client/src/observe.rs

@@ -304,5 +304,6 @@ mod tests {
         state.note_frame_spike(41.0, 50.0, Some(20.0));
         assert_eq!(state.events.len(), 1);
         assert_eq!(state.events[0].key, keys::PERF_FRAME_SPIKE);
+        assert!(state.events[0].detail.contains("frame_ms=40.00"));
     }
 }

crates/hex-core/Cargo.toml

@@ -14,3 +14,6 @@ serde = ["dep:serde"]
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"], optional = true }
+
+[dev-dependencies]
+serde_json.workspace = true