Generate palette projections at module build (#50)

*palcus.itp files are Toolset-derived snapshots (category skeleton + blueprint descriptors). This makes Crucible the generator: module builds strip stale descriptors from the committed skeletons and inject descriptors computed from the source-tree blueprints (NAME/STRREF + RESREF, plus CR/FACTION for creatures, faction names resolved via repute.fac). Compare applies the same projection; extract never writes *palcus.itp back into source, so local Toolset palette mess stays local.

Companion PR in sow-module strips the committed palcus files down to skeletons.

🤖 Generated with [Claude Code](https://claude.com/claude-code)Reviewed-on: #50

Co-authored-by: vickydotbat <vickydotbat@tutamail.com>

internal/pipeline/extract.go

@@ -124,6 +124,13 @@ func extractArchiveResources(p *project.Project, archive erf.Archive, desired ma
 			skippedCount++
 			continue
 		}
+		// *palcus.itp are Toolset-generated palette projections; the module
+		// build regenerates them from source blueprints, so extraction never
+		// writes them back into source.
+		if ext == "itp" && isPaletteProjectionResref(resource.Name) {
+			skippedCount++
+			continue
+		}
 
 		target, data, err := extractedFile(p, resource, ext)
 		if err != nil {