Add a CompoundCurve to (ramp, add) helper with a boot check

FlatLine -> (0, add), SlopedLine p -> (p, add), SlopedInitValLine p ->
(p, no add), checked against every static_power_effectmod and
static_power_action row (6228 rows; the 11 ramp value diffs are the
known 4.0 effectmod diffs). DefaultCurveUp/Down have no ramp form and
no mod or action uses them. The world boot checks five known DB rows
and logs curves without a ramp form.

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

src/engine/parsers/objects/wpak/CurveRamp.java

@@ -0,0 +1,83 @@
+//  • ▌ ▄ ·.  ▄▄▄·  ▄▄ • ▪   ▄▄· ▄▄▄▄·  ▄▄▄·  ▐▄▄▄  ▄▄▄ .
+//  ·██ ▐███▪▐█ ▀█ ▐█ ▀ ▪██ ▐█ ▌▪▐█ ▀█▪▐█ ▀█ •█▌ ▐█▐▌·
+//  ▐█ ▌▐▌▐█·▄█▀▀█ ▄█ ▀█▄▐█·██ ▄▄▐█▀▀█▄▄█▀▀█ ▐█▐ ▐▌▐▀▀▀
+//  ██ ██▌▐█▌▐█ ▪▐▌▐█▄▪▐█▐█▌▐███▌██▄▪▐█▐█ ▪▐▌██▐ █▌▐█▄▄▌
+//  ▀▀  █▪▀▀▀ ▀  ▀ ·▀▀▀▀ ▀▀▀·▀▀▀ ·▀▀▀▀  ▀  ▀ ▀▀  █▪ ▀▀▀
+//      Magicbane Emulator Project © 2013 - 2026
+//                https://www.magicbane.com
+
+package engine.parsers.objects.wpak;
+
+import org.pmw.tinylog.Logger;
+
+// A CompoundCurve in the server's (ramp, add) form, as stored in the DB ramp/useRampAdd and ramp/useAddFormula columns.
+// Mapping checked against every static_power_effectmod and static_power_action row (JSON-Refactor-Plan/scripts/p41.py).
+
+public class CurveRamp {
+
+    private static final int RAMP_RANGE = 100;
+
+    public final float ramp;
+    public final boolean useAdd;
+
+    private CurveRamp(float ramp, boolean useAdd) {
+        this.ramp = ramp;
+        this.useAdd = useAdd;
+    }
+
+    // Null when the curve is unknown or has no ramp form (multi-segment, or a range other than 100).
+    public static CurveRamp fromCurve(String curveName) {
+
+        CompoundCurveTemplate curve = CompoundCurveTemplate._curves.get(curveName);
+        CompoundCurveTemplate.Segment segment;
+
+        if (curve == null || curve.segments.size() != 1)
+            return null;
+
+        segment = curve.segments.get(0);
+
+        if (segment.down_per_range != RAMP_RANGE)
+            return null;
+
+        switch (segment.simple_curve) {
+            case "FlatLine":
+                return new CurveRamp(0, true);
+            case "SlopedLine":
+                return new CurveRamp(segment.params[0], true);
+            case "SlopedInitValLine":
+                return new CurveRamp(segment.params[0], false);
+            default:
+                return null;
+        }
+    }
+
+    // Boot check against known DB effectmod rows, one per curve kind, then a list of curves with no ramp form.
+    public static void verifyRampForms() {
+
+        int noRampCount = 0;
+
+        verify("SL0083Up", 0.83f, true);       // 1AX-001A MeleeDamageModifier
+        verify("SL0100Down", -1f, true);       // ACM-003A MeleeDamageModifier
+        verify("DefaultFlat", 0f, true);       // 1AX-003A DCV
+        verify("SIVL0014", 0.014f, false);     // ANM-002A Health
+        verify("SL0050Down", -0.5f, true);     // CON-100A Health
+
+        for (CompoundCurveTemplate curve : CompoundCurveTemplate._curves.values())
+            if (fromCurve(curve.name) == null) {
+                Logger.warn("Compound curve " + curve.name + " has no ramp form");
+                noRampCount++;
+            }
+
+        Logger.info("Compound curves with a ramp form: " + (CompoundCurveTemplate._curves.size() - noRampCount)
+                + " of " + CompoundCurveTemplate._curves.size());
+    }
+
+    private static void verify(String curveName, float ramp, boolean useAdd) {
+
+        CurveRamp curveRamp = fromCurve(curveName);
+
+        if (curveRamp == null || Math.abs(curveRamp.ramp - ramp) > 0.0001f || curveRamp.useAdd != useAdd)
+            Logger.error("Curve ramp check failed for " + curveName + ": expected (" + ramp + ", " + useAdd + ")"
+                    + (curveRamp == null ? " got none" : " got (" + curveRamp.ramp + ", " + curveRamp.useAdd + ")"));
+    }
+}

src/engine/server/world/WorldServer.java

@@ -41,6 +41,7 @@ import engine.parsers.objects.ItemTemplate;
 import engine.parsers.objects.RuneTemplate;
 import engine.parsers.objects.wpak.CharCreateRuneList;
 import engine.parsers.objects.wpak.CompoundCurveTemplate;
+import engine.parsers.objects.wpak.CurveRamp;
 import engine.parsers.objects.wpak.EffectTemplate;
 import engine.parsers.objects.wpak.ModTypeTemplate;
 import engine.parsers.objects.wpak.PowActionCostTemplate;
@@ -306,6 +307,8 @@ public class WorldServer {
             exit(1);
         }
 
+        CurveRamp.verifyRampForms();
+
         Logger.info("Loading Mod Types");
         ModTypeTemplate._modTypes = ModTypeParser.parseModTypesFile();