Release 2026.9.28.3

Per-protocol legacy switches (#79) and the hold export's exceptions
list (#75). The prepared Explain answers are relabeled for this
release; 706 carry over unchanged.

crates/types/src/branding.rs

@@ -81,7 +81,7 @@ fn legacy_setting(name: &str, is_set: impl Fn(&str) -> bool) -> Option<String> {
 #[macro_export]
 macro_rules! brand_version {
     () => {
-        "2026.9.28.2"
+        "2026.9.28.3"
     };
 }