antd-java: examples can't be run via gradle — `examples/` not registered as a subproject

[Nic-dorman]

Bug

antd-java ships runnable example sources at examples/Example01Connect.java, Example02PublicData.java, etc., but they can't be invoked through the gradle wrapper:

$ cd antd-java
$ bash gradlew examples:build --no-daemon
FAILURE: Build failed with an exception.
* What went wrong:
Cannot locate tasks that match 'examples:build' as project 'examples' not found in root project 'antd-java'.

Cause

antd-java/settings.gradle.kts declares only the root project — no subprojects:

rootProject.name = "antd-java"

Compare antd-kotlin/settings.gradle.kts:

rootProject.name = "antd-kotlin"
include("lib")
include("examples")

So antd-kotlin registers the examples as a runnable subproject with its own application plugin and gradlew :examples:run --args=2 works. antd-java doesn't, and currently the only way to compile the example is by hand (javac -cp build/libs/antd-java-*.jar examples/*.java), assembling the right classpath manually.

Fix

Mirror the antd-kotlin layout:

1. Move examples/Example*.java under examples/src/main/java/com/autonomi/examples/.
2. Add examples/build.gradle.kts declaring the application plugin + mainClass.
3. include("examples") in settings.gradle.kts.
4. bash gradlew :examples:run -PmainClass=... or --args=... (one entry point per example, matching what antd-kotlin does with Main.kt).

This also gives parity across the JVM SDKs and unblocks the cross-SDK ant dev example dispatcher (see #65).

Pre-existing setup issue (separate ticket?)

Also relevant: antd-java/gradlew is committed without the executable bit; users must chmod +x gradlew before the wrapper will run. antd-kotlin/ is missing the wrapper script and gradle-wrapper.jar entirely (only gradle-wrapper.properties is checked in — see #69). Happy to file these as a single "JVM SDK packaging" issue if preferred.

Environment

• JDK Temurin 17.0.19, gradle 9.4 (from wrapper)
• antd-java at main

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Found via cross-SDK e2e harness.