Random events: earthquakes, overflowing rivers, new gold veins (free games and versus, can be switched off)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/game.rs

@@ -604,6 +604,8 @@ pub struct Game {
     #[serde(default)]
     pub bridgework: crate::bridges::BridgeWork, // burning and worn bridges
     #[serde(default)]
+    pub happenings: Option<crate::events::Events>, // random events (free games and versus), see events.rs
+    #[serde(default)]
     pub stats: crate::stats::GameStats, // statistics of the master at this computer (see stats.rs)
     #[serde(default)]
     pub wall_plans: Vec<(usize, u8)>, // walls to raise: tile, master side (see walls.rs)
@@ -943,6 +945,7 @@ impl Game {
             vrng: crate::particles::vrng(),
             dwarf_caves: Vec::new(),
             bridgework: Default::default(),
+            happenings: None,
             stats: Default::default(),
             wall_plans: Vec::new(),
             wood: crate::wood::WOOD_START,
@@ -1715,6 +1718,7 @@ impl Game {
         self.update_dwarves(dt);
         self.update_bridges(dt);
         self.update_wood(dt);
+        self.update_events(dt);
         // fallen hearts of a match are shared state: every client marks them in the same step
         self.update_fallen_masters();
         // the end of the game and the fog are about the master at this computer