Add fire suppression hooks

Docs/TechnicalDesignDocument.md

@@ -376,6 +376,14 @@ Native hooks also let future UI/actions explicitly clear the fire area or
 contain the fire. Watched, cleared, contained, and extinguished fires reduce
 risk, while neglected fires continue accumulating ignition and spread pressure.
 
+Fire suppression uses explicit server-side hooks on `AAgrarianCampfire`.
+`ApplyFireSuppression` is the shared entry point, with named wrappers for water,
+dirt/sand, cleared firebreaks, and future tools. Suppression raises
+`FireSuppressionPressure`, reduces ignition risk, reduces active fire intensity,
+shrinks spread radius, and lets water/rain also drain fuel. Wet weather
+contributes passive suppression pressure so rain and storms naturally slow
+dangerous fires before later UI and inventory actions call the same hooks.
+
 Campfires expose native extinguish logic through `AAgrarianCampfire::Extinguish`.
 Extinguishing clears remaining fuel, turns off replicated lit state, and reuses
 the same visual update path as natural fuel depletion.