Fix CARROT sync regression: early view tag rejection for multi-output txs

Multi-output CARROT transactions store per-output D_e in additional_pubkeys
  (tag 0x04) with no tx_pubkey (tag 0x01), so the single-D_e pre-computation
  path was skipped entirely — every output hit the full _scanCarrotOutput path
  (~40ms each via FFI). Added per-output X25519 + 3-byte view tag rejection
  that restores post-fork sync from ~10 blk/s back to ~900+ blk/s.

  Also fixed parseExtra to handle 0xDE (minergate tag) and gracefully skip
  unknown tags via varint-length instead of aborting all remaining extra bytes.

scripts/build-ios.sh

@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
-# Build libsalvium_crypto.a for iOS (device + simulator)
+# Build libsalvium_crypto.a for iOS (device + simulator) as an xcframework.
 #
 # Prerequisites:
 #   rustup target add aarch64-apple-ios aarch64-apple-ios-sim x86_64-apple-ios
 #
-# Produces: prebuilt/ios/libsalvium_crypto.a (universal fat binary via lipo)
+# Produces: prebuilt/ios/SalviumCrypto.xcframework
 
 set -euo pipefail
 
@@ -12,6 +12,7 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 ROOT_DIR="$SCRIPT_DIR/.."
 CRATE_DIR="$ROOT_DIR/crates/salvium-crypto"
 OUT_DIR="$ROOT_DIR/prebuilt/ios"
+WORK_DIR="$OUT_DIR/build"
 
 TARGETS=(
   aarch64-apple-ios         # Device (arm64)
@@ -26,16 +27,30 @@ for target in "${TARGETS[@]}"; do
   cargo build --release --target "$target" --manifest-path "$CRATE_DIR/Cargo.toml"
 done
 
-echo "==> Creating universal binary with lipo..."
-mkdir -p "$OUT_DIR"
+echo "==> Creating xcframework..."
+mkdir -p "$WORK_DIR"
 
-# Collect all .a paths
-LIBS=()
-for target in "${TARGETS[@]}"; do
-  LIBS+=("$CRATE_DIR/target/$target/release/libsalvium_crypto.a")
-done
+# Device .a (single arch, no lipo needed)
+DEVICE_LIB="$CRATE_DIR/target/aarch64-apple-ios/release/libsalvium_crypto.a"
 
-lipo -create "${LIBS[@]}" -output "$OUT_DIR/libsalvium_crypto.a"
+# Merge simulator slices (aarch64-sim + x86_64) into one fat .a
+SIM_FAT="$WORK_DIR/libsalvium_crypto-sim.a"
+lipo -create \
+  "$CRATE_DIR/target/aarch64-apple-ios-sim/release/libsalvium_crypto.a" \
+  "$CRATE_DIR/target/x86_64-apple-ios/release/libsalvium_crypto.a" \
+  -output "$SIM_FAT"
+
+# Remove old xcframework if present
+rm -rf "$OUT_DIR/SalviumCrypto.xcframework"
+
+# Create xcframework from device .a + simulator fat .a
+xcodebuild -create-xcframework \
+  -library "$DEVICE_LIB" \
+  -library "$SIM_FAT" \
+  -output "$OUT_DIR/SalviumCrypto.xcframework"
+
+# Clean up work dir
+rm -rf "$WORK_DIR"
+
+echo "==> Done: $OUT_DIR/SalviumCrypto.xcframework"
 
-echo "==> Done: $OUT_DIR/libsalvium_crypto.a"
-lipo -info "$OUT_DIR/libsalvium_crypto.a"