fix: revert macosArm64 target (blocked by negentropy-kmp), add K/N toolchain to session hook

macosArm64 target cannot be enabled until negentropy-kmp publishes a
macosArm64 artifact — commented out with explanation. Reverted run_all.sh
back to Linux-only for K/Native benchmark.

Added Kotlin/Native toolchain dependencies (GCC sysroot, LLDB, LLVM,
libffi) to session-start.sh so K/N compilation works in Claude Code
remote environments where Gradle's own downloader fails through the
proxy.

https://claude.ai/code/session_01WSNE6QKiYM2ZutQD2UihCW

quartz/benchmarks/run_all.sh

@@ -82,26 +82,25 @@ fi
 echo ""
 
 # ============================================================================
-# 2. Kotlin/Native benchmark (Linux and macOS)
+# 2. Kotlin/Native benchmark
 # ============================================================================
-echo "=== Running Kotlin/Native benchmark ==="
-case "$OS_NAME" in
-    Linux)
-        KN_TARGET="linuxX64Test"
-        ;;
-    Darwin)
-        KN_TARGET="macosArm64Test"
-        ;;
-esac
+# macosArm64 target is blocked until negentropy-kmp publishes a macosArm64
+# artifact. Once unblocked, add:  Darwin) KN_TARGET="macosArm64Test" ;;
+if [ "$OS_NAME" = "Linux" ]; then
+    echo "=== Running Kotlin/Native benchmark ==="
+    KN_TARGET="linuxX64Test"
 
-"$ROOT/gradlew" -p "$ROOT" ":quartz:$KN_TARGET" --tests "*.Secp256k1NativeBenchmark" \
-    2>/dev/null || true
+    "$ROOT/gradlew" -p "$ROOT" ":quartz:$KN_TARGET" --tests "*.Secp256k1NativeBenchmark" \
+        2>/dev/null || true
 
-KN_XML="$ROOT/quartz/build/test-results/$KN_TARGET/TEST-${KN_TARGET}.com.vitorpamplona.quartz.utils.secp256k1.Secp256k1NativeBenchmark.xml"
-if [ -f "$KN_XML" ]; then
-    sed -n '/<!\[CDATA\[/,/\]\]>/p' "$KN_XML" | grep -v 'CDATA\|]]>'
+    KN_XML="$ROOT/quartz/build/test-results/$KN_TARGET/TEST-${KN_TARGET}.com.vitorpamplona.quartz.utils.secp256k1.Secp256k1NativeBenchmark.xml"
+    if [ -f "$KN_XML" ]; then
+        sed -n '/<!\[CDATA\[/,/\]\]>/p' "$KN_XML" | grep -v 'CDATA\|]]>'
+    else
+        echo "K/Native benchmark XML not found."
+    fi
 else
-    echo "K/Native benchmark XML not found."
+    echo "=== Skipping Kotlin/Native benchmark (only linuxX64 target available) ==="
 fi
 echo ""
 

quartz/build.gradle.kts

@@ -87,7 +87,7 @@ kotlin {
 
     linuxX64()
 
-    macosArm64()
+    // macosArm64() — blocked until negentropy-kmp publishes a macosArm64 artifact
 
     // This makes sure that the resource file directory is visible for iOS tests.
     val rootDir = "${rootProject.rootDir.path}/quartz/src/commonTest/resources"
@@ -299,23 +299,8 @@ kotlin {
             dependsOn(iosTest.get())
         }
 
-        val macosMain =
-            create("macosMain") {
-                dependsOn(appleMain)
-            }
-
-        val macosTest =
-            create("macosTest") {
-                dependsOn(appleTest)
-            }
-
-        val macosArm64Main by getting {
-            dependsOn(macosMain)
-        }
-
-        val macosArm64Test by getting {
-            dependsOn(macosTest)
-        }
+        // macosMain/macosTest source sets exist but are not wired until
+        // negentropy-kmp publishes a macosArm64 artifact.
 
         val linuxMain =
             create("linuxMain") {