M2: resolve an indirect annotation /Subtype before the Invisible print filter

The print filter read /Subtype with a direct-only lookup, so a standard
annotation whose /Subtype is an indirect reference (ISO 32000-2 §7.3.10)
looked like an unknown type and an Invisible flag dropped it from print
(Table 167 applies only to non-standard types, Table 171). The subtype is now
resolved through the document first.

Also removes a stray cell separator in the hayro-interpret row of
vendor/README.md that pushed the test references for patches (44)-(56) out
of the table.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC

crates/print/src/lib.rs

@@ -760,7 +760,9 @@ fn prints(doc: &Document, d: &Dict, content: Content) -> bool {
     if flags & PRINT == 0 || flags & HIDDEN != 0 {
         return false;
     }
-    let subtype = d.name(b"Subtype").unwrap_or(b"");
+    // `/Subtype` may be an indirect reference (ISO 32000-2 §7.3.10), so resolve it first.
+    let subtype_obj = d.get(b"Subtype").map(|s| doc.resolve(s));
+    let subtype = subtype_obj.as_deref().and_then(Object::as_name).unwrap_or(b"");
     match subtype {
         b"Widget" => true,
         b"Link" | b"Popup" => false,

crates/print/src/tests.rs

@@ -981,4 +981,11 @@ fn invisible_annotations_of_unknown_types_do_not_print() {
     assert!(!prints(&doc, &annot(None, 5), all), "no Subtype is no standard type");
     assert!(prints(&doc, &annot(Some("Square"), 5), all), "Invisible doesn't apply to a standard type");
     assert!(prints(&doc, &annot(Some("Widget"), 5), Content::FormFieldsOnly), "nor to a field");
+
+    // An indirect `/Subtype` (§7.3.10) is resolved: a standard type stays standard.
+    let mut doc = doc;
+    let square = doc.add(Object::name("Square"));
+    let mut indirect = annot(None, 5);
+    indirect.set(b"Subtype".to_vec(), Object::Ref(square));
+    assert!(prints(&doc, &indirect, all), "an indirect standard Subtype");
 }