fix(topdata): encode spell radial feat IDs (#37)

## Summary
- add explicit `{"spellradial": {"id": "feat:key"}}` authoring syntax for `spells.2da` `FeatID`
- resolve spell and feat rows dynamically and emit NWN:EE packed subradial values
- reject malformed or misplaced spell-radial references

## Verification
- `go test ./internal/topdata`

Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Reviewed-on: #37
Reviewed-by: archvillainette <vickydotbat@tutamail.com>
Reviewed-by: xtul <mpiasecki720@protonmail.com>
Co-authored-by: gitea-bot <gitea-bot@noreply.git.westgate.pw>
Co-committed-by: gitea-bot <gitea-bot@noreply.git.westgate.pw>

internal/topdata/native.go

@@ -4712,6 +4712,24 @@ func (r *valueResolver) resolveValue(row map[string]any, field string, value any
 
 	switch typed := value.(type) {
 	case map[string]any:
+		if radial, ok := typed["spellradial"].(map[string]any); ok && len(typed) == 1 {
+			if r.dataset.Name != "spells" || field != "FeatID" {
+				return tlkCompiledValue{}, fmt.Errorf("spellradial reference is only valid for spells.FeatID")
+			}
+			radialKey, ok := radial["id"].(string)
+			if !ok || len(radial) != 1 {
+				return tlkCompiledValue{}, fmt.Errorf("spellradial reference requires exactly one id")
+			}
+			featID, ok := r.keyToID[radialKey]
+			if !ok {
+				return tlkCompiledValue{}, fmt.Errorf("unknown spellradial feat reference: %s", radialKey)
+			}
+			spellID, ok := row["id"].(int)
+			if !ok {
+				return tlkCompiledValue{}, fmt.Errorf("spellradial reference requires a numeric spell row id")
+			}
+			return tlkCompiledValue{Value: spellID<<16 + featID}, nil
+		}
 		if encoding, ok := r.valueEncodingForField(field); ok {
 			mode := strings.TrimSpace(encoding.Mode)
 			_, hasList := typed["list"]

internal/topdata/topdata_test.go

@@ -11887,7 +11887,7 @@ func TestBuildSupportsCanonicalSpells(t *testing.T) {
     "spells:disarm": {
       "Label": "Disarm",
       "Name": "501",
-      "FeatID": {"id": "feat:disarm"},
+      "FeatID": {"spellradial": {"id": "feat:specialattacks"}},
       "Master": {"id": "spells:specialattacks"},
       "Category": {"ref": "spells:specialattacks", "field": "Category"}
     }
@@ -11939,7 +11939,7 @@ func TestBuildSupportsCanonicalSpells(t *testing.T) {
 		!strings.Contains(text, "\t1000\t") ||
 		!strings.Contains(text, "841\tDisarm\t501") ||
 		!strings.Contains(text, "\t840\t") ||
-		!strings.Contains(text, "\t1001\t") ||
+		!strings.Contains(text, "\t55116776\t") ||
 		!strings.Contains(text, "849\tBard_Fascinate\t600") ||
 		!strings.Contains(text, "\t601\t") ||
 		!strings.Contains(text, "\t602\t") ||