Harden Android accessibility, localization and startup (#105)

Implement independent hardening and regression coverage. Keep #105 open for final feature and environment coverage after #106–#110; document the completion boundary and resume order.

tools/android-build/src/main.rs

@@ -142,6 +142,7 @@ fn check(root: &Path) -> Result<(), Box<dyn Error>> {
     let project = regex::Regex::new(r#"project\s*\(\s*"\:([^\"]+)"\s*\)"#)?;
     for (module, allowed) in [
         ("app", &["features", "core", "platform"][..]),
+        ("performance", &["app"][..]),
         ("features", &["core"][..]),
         ("core", &["rust-bridge"][..]),
         ("platform", &["core"][..]),