fix(zstd): adopt renamed context/dictionary classes for zstd 0.7

zstd 0.7 renamed the FFM binding classes: ZstdCompressCtx → ZstdCompressContext,
ZstdDecompressCtx → ZstdDecompressContext, ZstdDecompressDict →
ZstdDecompressDictionary. Method signatures are unchanged, so the encoder/decoder
just track the new names.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: dfa1

reader/src/main/java/io/github/dfa1/vortex/reader/decode/ZstdEncodingDecoder.java

@@ -19,8 +19,8 @@
 import io.github.dfa1.vortex.reader.array.MaterializedShortArray;
 import io.github.dfa1.vortex.reader.array.VarBinArray;
 
-import io.github.dfa1.zstd.ZstdDecompressCtx;
-import io.github.dfa1.zstd.ZstdDecompressDict;
+import io.github.dfa1.zstd.ZstdDecompressContext;
+import io.github.dfa1.zstd.ZstdDecompressDictionary;
 
 import java.io.IOException;
 import java.lang.foreign.Arena;
@@ -168,9 +168,9 @@ private static MemorySegment decompressFrames(
         boolean hasDictionary = meta.dictionary_size() != 0;
         int frameBufferBase = hasDictionary ? 1 : 0;
         MemorySegment out = ctx.arena().allocate(totalUncompressed);
-        try (ZstdDecompressCtx dctx = new ZstdDecompressCtx();
+        try (ZstdDecompressContext dctx = new ZstdDecompressContext();
              Arena scratch = Arena.ofConfined()) {
-            ZstdDecompressDict dictionary = hasDictionary
+            ZstdDecompressDictionary dictionary = hasDictionary
                     ? digestDictionary(asNative(ctx.buffer(0), scratch), meta.dictionary_size())
                     : null;
             try {
@@ -207,13 +207,13 @@ private static MemorySegment decompressFrames(
     /// `declaredSize` is the metadata's `dictionary_size`; it must match the dictionary buffer's
     /// byte size (the Rust reference enforces the same invariant), otherwise the segment is
     /// malformed and we fail fast rather than digest a truncated dictionary.
-    private static ZstdDecompressDict digestDictionary(MemorySegment dictBuffer, long declaredSize) {
+    private static ZstdDecompressDictionary digestDictionary(MemorySegment dictBuffer, long declaredSize) {
         if (dictBuffer.byteSize() != declaredSize) {
             throw new VortexException(EncodingId.VORTEX_ZSTD,
                     "dictionary size metadata " + declaredSize
                             + " does not match buffer size " + dictBuffer.byteSize());
         }
-        return new ZstdDecompressDict(dictBuffer);
+        return new ZstdDecompressDictionary(dictBuffer);
     }
 
     /// Returns `seg` unchanged when it is already native (the production mmap path); otherwise

writer/src/main/java/io/github/dfa1/vortex/writer/encode/ZstdEncodingEncoder.java

@@ -1,6 +1,6 @@
 package io.github.dfa1.vortex.writer.encode;
 
-import io.github.dfa1.zstd.ZstdCompressCtx;
+import io.github.dfa1.zstd.ZstdCompressContext;
 import io.github.dfa1.vortex.core.model.DType;
 import io.github.dfa1.vortex.core.model.PType;
 import io.github.dfa1.vortex.core.error.VortexException;
@@ -241,7 +241,7 @@ private static Frames compressFrames(MemorySegment raw, FrameLayout layout, Aren
         List<MemorySegment> compressed = new ArrayList<>(frameCount);
         List<ProtoZstdFrameMetadata> metas = new ArrayList<>(frameCount);
         long offset = 0;
-        try (ZstdCompressCtx cctx = new ZstdCompressCtx()) {
+        try (ZstdCompressContext cctx = new ZstdCompressContext()) {
             for (int f = 0; f < frameCount; f++) {
                 long len = layout.byteLengths()[f];
                 compressed.add(cctx.compress(arena, raw.asSlice(offset, len)));

writer/src/test/java/io/github/dfa1/vortex/writer/encode/ZstdEncodingEncoderTest.java

@@ -1,7 +1,7 @@
 package io.github.dfa1.vortex.writer.encode;
 
 import io.github.dfa1.zstd.Zstd;
-import io.github.dfa1.zstd.ZstdCompressCtx;
+import io.github.dfa1.zstd.ZstdCompressContext;
 import io.github.dfa1.zstd.ZstdDictionary;
 import io.github.dfa1.vortex.core.model.DType;
 import io.github.dfa1.vortex.core.model.PType;
@@ -261,7 +261,7 @@ private static byte[] compress(byte[] input) {
         }
 
         private static byte[] compressWithDict(byte[] input, byte[] dict) {
-            try (ZstdCompressCtx cctx = new ZstdCompressCtx()) {
+            try (ZstdCompressContext cctx = new ZstdCompressContext()) {
                 return cctx.compress(input, ZstdDictionary.of(dict));
             }
         }