Generate palette projections at module build; never extract them

*palcus.itp files are Toolset-generated snapshots: category skeleton plus
one descriptor per custom blueprint. Treat them as derived data. Module
source now commits only descriptor-free skeletons; build strips any stale
descriptors and re-inserts descriptors computed from the blueprints in the
source tree (name/STRREF, resref, and CR/faction for creatures), so the
DM Creator lists always match what actually ships in the .mod. Compare
applies the same projection. Extract skips *palcus.itp entirely, so local
Toolset palette churn can no longer leak into module source.

Blueprints with PaletteID 255 (hidden) or no PaletteID are omitted, per
engine convention.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

internal/pipeline/compare.go

@@ -117,6 +117,10 @@ func expectedResources(p *project.Project) (map[string]resourceExpectation, erro
 	if err != nil {
 		return nil, err
 	}
+	palettes, err := collectPaletteDescriptors(p)
+	if err != nil {
+		return nil, err
+	}
 
 	for _, rel := range p.Inventory.SourceFiles {
 		abs := filepath.Join(p.SourceDir(), filepath.FromSlash(rel))
@@ -136,6 +140,9 @@ func expectedResources(p *project.Project) (map[string]resourceExpectation, erro
 		if extension == ".ifo" && strings.EqualFold(name, "module") && len(moduleHakOrder) > 0 {
 			setModuleHAKList(&document, moduleHakOrder)
 		}
+		if extension == ".itp" && isPaletteProjectionResref(name) {
+			projectPaletteDocument(&document, palettes[strings.ToLower(name)])
+		}
 
 		canonical, err := json.Marshal(document)
 		if err != nil {