docs: add compatibility notes for playerbots setups

CHANGELOG.md

@@ -8,6 +8,8 @@ All notable changes to `mod-gold-rush` will be documented in this file.
 - Standalone repository documentation in `README.md`.
 - Initial `CHANGELOG.md` for tracking module releases.
 - Clear documentation that `mod-playerbots` is a required dependency.
+- Added a compatibility section describing the AzerothCore + Playerbots
+  expectations for this module.
 
 ### Changed
 - Loosened Gold Rush hotspot selection so events can fall back to eligible

README.md

@@ -17,6 +17,18 @@ playerbots into the area to create a PvPvE scramble.
 - Gold Rush bot routing, hotspot pressure, and related behavior depend on
   Playerbots APIs.
 
+## Compatibility
+
+- Built for AzerothCore-based setups that include `mod-playerbots`.
+- Not compatible with a stock AzerothCore setup that does not have
+  `mod-playerbots` installed.
+- Gold Rush directly includes Playerbots headers and uses Playerbots runtime
+  APIs for routing bots to event hotspots.
+- If `mod-playerbots` is missing, Gold Rush should be expected to fail to
+  build or fail to function correctly.
+- Best fit: the same Playerbot-oriented AzerothCore environment this module is
+  being developed and tested against.
+
 ## Features
 
 - Schedules Gold Rush events on a random interval.