feat: add stub encodings for masked/patched/variant

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: dfa1

core/src/main/java/io/github/dfa1/vortex/encoding/MaskedEncoding.java

@@ -0,0 +1,24 @@
+package io.github.dfa1.vortex.encoding;
+
+import io.github.dfa1.vortex.core.DType;
+import io.github.dfa1.vortex.core.VortexException;
+import io.github.dfa1.vortex.core.array.Array;
+
+/// Stub for {@code vortex.masked} — not yet implemented.
+public final class MaskedEncoding implements Encoding {
+
+	@Override
+	public EncodingId encodingId() {
+		return EncodingId.VORTEX_MASKED;
+	}
+
+	@Override
+	public EncodeResult encode(DType dtype, Object data) {
+		throw new VortexException(EncodingId.VORTEX_MASKED, "not yet implemented");
+	}
+
+	@Override
+	public Array decode(DecodeContext ctx) {
+		throw new VortexException(EncodingId.VORTEX_MASKED, "not yet implemented");
+	}
+}

core/src/main/java/io/github/dfa1/vortex/encoding/PatchedEncoding.java

@@ -0,0 +1,24 @@
+package io.github.dfa1.vortex.encoding;
+
+import io.github.dfa1.vortex.core.DType;
+import io.github.dfa1.vortex.core.VortexException;
+import io.github.dfa1.vortex.core.array.Array;
+
+/// Stub for {@code vortex.patched} — not yet implemented.
+public final class PatchedEncoding implements Encoding {
+
+	@Override
+	public EncodingId encodingId() {
+		return EncodingId.VORTEX_PATCHED;
+	}
+
+	@Override
+	public EncodeResult encode(DType dtype, Object data) {
+		throw new VortexException(EncodingId.VORTEX_PATCHED, "not yet implemented");
+	}
+
+	@Override
+	public Array decode(DecodeContext ctx) {
+		throw new VortexException(EncodingId.VORTEX_PATCHED, "not yet implemented");
+	}
+}

core/src/main/java/io/github/dfa1/vortex/encoding/VariantEncoding.java

@@ -0,0 +1,24 @@
+package io.github.dfa1.vortex.encoding;
+
+import io.github.dfa1.vortex.core.DType;
+import io.github.dfa1.vortex.core.VortexException;
+import io.github.dfa1.vortex.core.array.Array;
+
+/// Stub for {@code vortex.variant} — not yet implemented.
+public final class VariantEncoding implements Encoding {
+
+	@Override
+	public EncodingId encodingId() {
+		return EncodingId.VORTEX_VARIANT;
+	}
+
+	@Override
+	public EncodeResult encode(DType dtype, Object data) {
+		throw new VortexException(EncodingId.VORTEX_VARIANT, "not yet implemented");
+	}
+
+	@Override
+	public Array decode(DecodeContext ctx) {
+		throw new VortexException(EncodingId.VORTEX_VARIANT, "not yet implemented");
+	}
+}

core/src/main/resources/META-INF/services/io.github.dfa1.vortex.encoding.Encoding

@@ -28,3 +28,6 @@ io.github.dfa1.vortex.encoding.VarBinEncoding
 io.github.dfa1.vortex.encoding.VarBinViewEncoding
 io.github.dfa1.vortex.encoding.ZigZagEncoding
 io.github.dfa1.vortex.encoding.ZstdEncoding
+io.github.dfa1.vortex.encoding.MaskedEncoding
+io.github.dfa1.vortex.encoding.PatchedEncoding
+io.github.dfa1.vortex.encoding.VariantEncoding