fix: align all 3 benchmarks to identical operation set

All 3 platform benchmarks (Android, JVM, K/Native) now measure the
same core operations for cross-platform comparability:

  verifySchnorr        — strict BIP-340
  verifySchnorrFast    — Nostr x-check only (no y-parity inversion)
  signSchnorr          — derives pubkey each time
  signSchnorr(cached)  — pre-computed x-only pubkey
  compressedPubKeyFor  — create + compress
  secKeyVerify         — key validation
  privKeyTweakAdd      — BIP-32 key derivation
  ecdhXOnly            — Nostr ECDH (NIP-04/44)
  batch verify (8, 16) — same-pubkey batch

Changes:
- Android: added signSchnorrCachedPkOurs, ecdhXOnly/ecdhXOnlyOurs
  (replaced pubKeyTweakMulCompact naming)
- JVM: removed pubkeyCreate and pubKeyCompress (subsets of
  compressedPubKeyFor, not measured on other platforms)
- K/Native: added verifySchnorrFast

K/Native retains field micro-benchmarks (FieldP.mul/sqr/add/sub/inv,
unsignedMultiplyHigh, uLt) as a K/N-specific diagnostic tool.

https://claude.ai/code/session_01EMY5RnXb9rnsyU2KbXrSaY

quartz/src/jvmTest/kotlin/com/vitorpamplona/quartz/utils/secp256k1/Secp256k1Benchmark.kt

@@ -201,36 +201,6 @@ class Secp256k1Benchmark {
                 },
             )
 
-        // --- pubkeyCreate ---
-        results +=
-            bench(
-                name = "pubkeyCreate",
-                warmup = 1000,
-                iterations = 5000,
-                nativeOp = { native.pubkeyCreate(privKey) },
-                kotlinOp = {
-                    com.vitorpamplona.quartz.utils.secp256k1.Secp256k1
-                        .pubkeyCreate(privKey)
-                },
-            )
-
-        // --- pubKeyCompress ---
-        val uncompressedNative = native.pubkeyCreate(privKey)
-        val uncompressedKotlin =
-            com.vitorpamplona.quartz.utils.secp256k1.Secp256k1
-                .pubkeyCreate(privKey)
-        results +=
-            bench(
-                name = "pubKeyCompress",
-                warmup = 2000,
-                iterations = 50000,
-                nativeOp = { native.pubKeyCompress(uncompressedNative) },
-                kotlinOp = {
-                    com.vitorpamplona.quartz.utils.secp256k1.Secp256k1
-                        .pubKeyCompress(uncompressedKotlin)
-                },
-            )
-
         // --- compressedPubKeyFor (create + compress combined) ---
         results +=
             bench(

quartz/src/linuxX64Test/kotlin/com/vitorpamplona/quartz/utils/secp256k1/Secp256k1NativeBenchmark.kt

@@ -125,6 +125,12 @@ class Secp256k1NativeBenchmark {
                 Secp256k1.verifySchnorr(sig, msg32, xOnlyPub)
             }
 
+        // --- verifySchnorrFast (Nostr: x-check only, no y-parity inversion) ---
+        results +=
+            bench("verifySchnorrFast", 2000, 5000) {
+                Secp256k1.verifySchnorrFast(sig, msg32, xOnlyPub)
+            }
+
         // --- signSchnorr (derives pubkey each time) ---
         results +=
             bench("signSchnorr", 1000, 3000) {