diff --git a/src/simulator/api-gdext/src/lib.rs b/src/simulator/api-gdext/src/lib.rs
index 86d096f5..2ec6d5d5 100644
--- a/src/simulator/api-gdext/src/lib.rs
+++ b/src/simulator/api-gdext/src/lib.rs
@@ -8423,6 +8423,91 @@ impl GdWorldSim {
         n as i64
     }
 
+    /// Load the three event-threshold configs from their canonical JSON pack
+    /// text (Rail 2). Each argument is the full file text; an empty string
+    /// keeps the current (Default) thresholds for that channel. Geological and
+    /// biological have authored JSONs (`geological_thresholds.json`,
+    /// `biological_events.json`); anomalous has none yet, so pass `""` to keep
+    /// Default. Returns `false` if any non-empty arg failed to parse (the
+    /// corresponding channel is left unchanged).
+    ///
+    /// The live loop loads the production-rate JSONs (rare events). Proof scenes
+    /// / tests pass boosted-threshold JSON so events fire reliably in N turns.
+    #[func]
+    fn load_thresholds_from_json(
+        &mut self,
+        geo_json: GString,
+        bio_json: GString,
+        anomalous_json: GString,
+    ) -> bool {
+        let mut ok = true;
+        let mut load = |text: GString, apply: &mut dyn FnMut(&serde_json::Value)| {
+            let s = text.to_string();
+            if s.is_empty() {
+                return;
+            }
+            match serde_json::from_str::<serde_json::Value>(&s) {
+                Ok(v) => apply(&v),
+                Err(e) => {
+                    godot_error!("GdWorldSim::load_thresholds_from_json parse error: {e}");
+                    ok = false;
+                }
+            }
+        };
+        load(geo_json, &mut |v| {
+            self.geo_thresholds = mc_mapgen::events::GeologicalThresholds::from_spec(v);
+        });
+        load(bio_json, &mut |v| {
+            self.bio_thresholds = mc_ecology::biological::BiologicalThresholds::from_spec(v);
+        });
+        load(anomalous_json, &mut |v| {
+            self.anomalous_thresholds = mc_climate::anomalous::AnomalousThresholds::from_spec(v);
+        });
+        ok
+    }
+
+    /// Run one continuous-worldsim event pass against the LIVE grid for the
+    /// playable turn loop (`turn_manager.gd`), which holds a `GdGridState`
+    /// (the shared climate/ecology grid) rather than a `GdGameState`.
+    ///
+    /// Read-modify-WRITE: the live `GridState` is moved into a temporary
+    /// `GameState` shell, `dispatch_world_events` mutates it (eco-damage into
+    /// the owned `eco_map`, plus grid-side effects — `bloom_streak`
+    /// accumulation, geological elevation/movement deltas), then the mutated
+    /// grid is moved back into the `GdGridState`. This is critical: a
+    /// clone-and-discard would silently drop the grid mutations (bloom would
+    /// never accumulate, geological terrain effects would vanish) while
+    /// `eco_map` still grew — a false-positive.
+    ///
+    /// The temporary `fog_map` is discarded (the live loop has no Rust-side
+    /// fog state to write back to — fog is GDScript-rendered). FogBank events
+    /// therefore have no in-game effect yet; wiring fog write-back is a
+    /// follow-up. Returns the number of events dispatched.
+    #[func]
+    fn dispatch_on_grid(&mut self, mut grid: Gd<GdGridState>, turn: i64, seed: i64) -> i64 {
+        let mut bound = grid.bind_mut();
+        // Move the live grid out via mem::replace with an empty 0×0 grid, run
+        // dispatch against a GameState shell, then move the mutated grid back.
+        let taken = std::mem::replace(&mut bound.inner, mc_core::grid::GridState::new(0, 0));
+        let mut shell = mc_state::game_state::GameState::default();
+        shell.grid = Some(taken);
+        shell.turn = turn.max(0) as u32;
+        let n = mc_worldsim::dispatch_world_events(
+            &mut shell,
+            seed as u64,
+            &self.geo_thresholds,
+            &self.bio_thresholds,
+            &self.anomalous_thresholds,
+            &mut self.eco_map,
+            &mut self.chronicle,
+        );
+        // Write the mutated grid back into the live GdGridState.
+        if let Some(g) = shell.grid.take() {
+            bound.inner = g;
+        }
+        n as i64
+    }
+
     /// Total number of world-event entries accumulated in the chronicle since
     /// construction (or last restore). Cheap progress probe for tests / HUD.
     #[func]