feat(jpms): add module-info.java to core, reader, writer

- core: exports encoding/fbs/proto pkgs, uses+provides Encoding via ServiceLoader
- reader: exports io/scan pkgs, requires java.net.http
- writer: exports writer pkg

Both flatbuffers-java and protobuf-java resolve as automatic modules (no
module-info in upstream jars). flatbuffers-java name is filename-derived,
which blocks Maven Central publishing of this project as a proper modular jar.

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

Author: dfa1

core/src/main/java/module-info.java

@@ -0,0 +1,34 @@
+module io.github.dfa1.vortex.core {
+    requires com.google.protobuf;
+    requires flatbuffers.java;
+
+    exports io.github.dfa1.vortex.core;
+    exports io.github.dfa1.vortex.core.array;
+    exports io.github.dfa1.vortex.encoding;
+    exports io.github.dfa1.vortex.fbs;
+    exports dev.vortex.proto;
+
+    uses io.github.dfa1.vortex.encoding.Encoding;
+
+    provides io.github.dfa1.vortex.encoding.Encoding with
+        io.github.dfa1.vortex.encoding.AlpEncoding,
+        io.github.dfa1.vortex.encoding.BitpackedEncoding,
+        io.github.dfa1.vortex.encoding.BoolEncoding,
+        io.github.dfa1.vortex.encoding.ByteBoolEncoding,
+        io.github.dfa1.vortex.encoding.ConstantEncoding,
+        io.github.dfa1.vortex.encoding.DeltaEncoding,
+        io.github.dfa1.vortex.encoding.DictEncoding,
+        io.github.dfa1.vortex.encoding.ExtEncoding,
+        io.github.dfa1.vortex.encoding.FrameOfReferenceEncoding,
+        io.github.dfa1.vortex.encoding.FsstEncoding,
+        io.github.dfa1.vortex.encoding.NullEncoding,
+        io.github.dfa1.vortex.encoding.PcoEncoding,
+        io.github.dfa1.vortex.encoding.PrimitiveEncoding,
+        io.github.dfa1.vortex.encoding.RunEndEncoding,
+        io.github.dfa1.vortex.encoding.SequenceEncoding,
+        io.github.dfa1.vortex.encoding.SparseEncoding,
+        io.github.dfa1.vortex.encoding.StructEncoding,
+        io.github.dfa1.vortex.encoding.VarBinEncoding,
+        io.github.dfa1.vortex.encoding.VarBinViewEncoding,
+        io.github.dfa1.vortex.encoding.ZigZagEncoding;
+}

reader/src/main/java/module-info.java

@@ -0,0 +1,9 @@
+module io.github.dfa1.vortex.reader {
+    requires io.github.dfa1.vortex.core;
+    requires com.google.protobuf;
+    requires flatbuffers.java;
+    requires java.net.http;
+
+    exports io.github.dfa1.vortex.io;
+    exports io.github.dfa1.vortex.scan;
+}

writer/src/main/java/module-info.java

@@ -0,0 +1,7 @@
+module io.github.dfa1.vortex.writer {
+    requires io.github.dfa1.vortex.core;
+    requires com.google.protobuf;
+    requires flatbuffers.java;
+
+    exports io.github.dfa1.vortex.writer;
+}