fix(render): show exact remaining ammunition

Reference: lolink’s numeric ammunition display in https://github.com/Yilegendoflink/garrison-protocol/commit/071ed14aa27d5ebf54e57447c958f2681737403c. This implementation uses the existing PIXI HUD and exact snapshot counts; no fork code is copied.

docs/history/0.2.4.md

@@ -274,3 +274,10 @@ enemy: picking emitted a unit click with no definition, instead of the tile clic
 engine-canvas regression retains the card/100 HP assertions and also covers another field refresh, live HP loss and
 closing the card when the crate is destroyed. Device metadata supplied by the new entry still wins; changing fields
 does not carry old devices across. Gameplay and allied targeting rules are unchanged.
+
+### 29.15 Ammunition readout
+
+Active ammunition skills show remaining rounds and magazine capacity below the segmented bar (§10), including
+Laterano's extra rounds and refills. The renderer reads the existing exact snapshot counts rather than estimating
+them from SP. Missing ammunition snapshots, preparation and death hide the number. Dense magazines retain their
+numeric readout when the renderer omits cell separators. Combat rules and golden results are unchanged.