Adding TODO note to Ed25519

src/main/java/swiss/qpq/gajumaru/core/crypto/Ed25519.java

@@ -31,6 +31,20 @@ import swiss.qpq.gajumaru.core.tools.CryptoUtils;
 // Uses exquisitely annoying Radix-2^25.5 field arithmetic. Never do this if you can avoid it.
 // Verified against the canonical Erlang ec_utils (see test/README.md for how).
 
+// TODO: Craig 2026-08-21
+//  I don't like the allocation of Scratch and Ge all over the place.
+//  If someone were to apply this library to a high-throughput system, with many threads
+//  signing stuff willy-nilly, then intense GC pressure could result simply because of
+//  all the dead (and zeroed) Scratch and Ge space left littered throughout the dead heap
+//  awaiting GC. What I want to do instead is provide a separate call path that allows the
+//  current mechanism to work as well as a slightly lower-level call path where the caller
+//  can provide a pre-allocated space by reference so if a high-throughput system is using
+//  lots of worker threads and really pressuring the system, the caller can pre-allocate the
+//  needed GC and Scratch space themselves once per thread.
+//
+//  This should be pretty easy.
+//  I just don't want to look at this module for at least a few days.
+
 public final class Ed25519 {
 
     // Precomputed limbs for Ed25519 constants (Radix 2^25.5)