Issue #165 publish and advertise all reactor libraries on release

The release workflow deployed on JDK 21, so the jtd-codegen profile
([24,)) never activated and json-java21-jtd-codegen plus jtd2jar were
silently absent from Central publishes. The deploy step now runs on
JDK 25 (matching the daily CI matrix), the GitHub Release body lists
every Maven coordinate, and README gains a Published Artifacts
section mapping each coordinate to its purpose and runtime.

Author: simbo1905

.github/workflows/release-on-tag.yml

@@ -27,7 +27,10 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: '21'
+          # JDK 25 activates the jtd-codegen profile ([24,)) so the
+          # json-java21-jtd-codegen and jtd2jar modules join the reactor
+          # and are published too (issue #165).
+          java-version: '25'
           cache: maven
           server-id: central
           # setup-java expects ENVIRONMENT VARIABLE NAMES here, not values;
@@ -51,6 +54,10 @@ jobs:
           tag_name: ${{ github.ref_name }}
           generate_release_notes: true
           body: |
+            ## Maven Central Artifacts
+
+            All reactor modules are published under `io.github.simbo1905.json` at version `${{ steps.version.outputs.version }}`: [`java.util.json`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json), [`java.util.json.jsonpath`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jsonpath), [`java.util.json.jtd`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jtd), [`java.util.json.jtd.codegen`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jtd.codegen), [`jtd2jar`](https://central.sonatype.com/artifact/io.github.simbo1905.json/jtd2jar), [`json-compatibility-suite`](https://central.sonatype.com/artifact/io.github.simbo1905.json/json-compatibility-suite), [`json-java21-api-tracker`](https://central.sonatype.com/artifact/io.github.simbo1905.json/json-java21-api-tracker).
+
             ## Docker Image
 
             Pre-built distroless container image available on GitHub Container Registry:

README.md

@@ -9,6 +9,22 @@ References:
 This project is not an official release; APIs and behaviour may change as upstream evolves. 
 You can find this code on [Maven Central](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json). 
 
+## Published Artifacts
+
+Every tagged release publishes all reactor modules to Maven Central under `io.github.simbo1905.json` (version = release date, e.g. `2026.08.30`):
+
+| Artifact | Purpose | Runtime |
+|---|---|---|
+| [`java.util.json`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json) | Core JSON API (incubator backport) | JDK 21+ |
+| [`java.util.json.jsonpath`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jsonpath) | JsonPath query engine over `JsonValue` | JDK 21+ |
+| [`java.util.json.jtd`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jtd) | JSON Type Definition validator (RFC 8927) | JDK 21+ |
+| [`java.util.json.jtd.codegen`](https://central.sonatype.com/artifact/io.github.simbo1905.json/java.util.json.jtd.codegen) | Codegen validators (~9x faster than the interpreter) | JDK 25+ |
+| [`jtd2jar`](https://central.sonatype.com/artifact/io.github.simbo1905.json/jtd2jar) | Compiles a JTD schema into a standalone validator JAR | JDK 21+ |
+| [`json-compatibility-suite`](https://central.sonatype.com/artifact/io.github.simbo1905.json/json-compatibility-suite) | JSON Test Suite compatibility validation | JDK 21+ |
+| [`json-java21-api-tracker`](https://central.sonatype.com/artifact/io.github.simbo1905.json/json-java21-api-tracker) | Upstream API drift tracking | JDK 21+ |
+
+The `jtd2jar` distroless container image is additionally published to GHCR: `ghcr.io/simbo1905/java.util.json.java21/jtd2jar:<version>`.
+
 This repo is organized into the following modules:
 
 | Module | What it is | JDK |