M9.4: raster effects in PDF export — shadows/outer glows as images under the untouched vector object, inner glow/feather/blur as images, at the document's resolution; Effect → Document Raster Effects Settings… (document.rasterEffectsSettings: screen/medium/high/ppi); engine::export_pdf used by app, CLI and MCP

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

crates/engine/src/cmd/mod.rs

@@ -27,6 +27,7 @@ mod path;
 mod pathops;
 mod patterncmds;
 pub mod prefscmds;
+pub mod rasterfx;
 mod recolor;
 mod select;
 mod textedit;
@@ -163,6 +164,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(threads::specs());
         v.extend(textwrap::specs());
         v.extend(graph::specs());
+        v.extend(rasterfx::specs());
         v.extend(docmenu::specs());
         v.extend(docinfo::specs());
         v.extend(panelcmds::specs());