Add documentation site generation for Java SDK (#1524)

* Add Maven Site infrastructure and cross-repo site deployment for Java SDK

Port src/site/ from the standalone repo (copilot-sdk-java) to the
monorepo's java/ directory. Add maven-resources-plugin executions for
site filtering, maven-site-plugin configuration with doxia-module-markdown,
and a full <reporting> section (javadoc, JaCoCo, surefire, SpotBugs,
taglist, dependency analysis).

Add a deploy-site job to java-publish-maven.yml that triggers the
standalone repo's deploy-site.yml workflow after a release, passing
version and monorepo tag information.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove site content and plugins from monorepo — moved to standalone repo

Site content (src/site/) and reporting plugins now live in
github/copilot-sdk-java where the gh-pages deployment runs.
The monorepo only triggers the standalone's deploy-site workflow
and provides the Java source at the release tag.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Replace inline deploy-site job with temporary test workflow

- Remove deploy-site job from java-publish-maven.yml (will be re-added
  after validation)
- Add PR-1524-test-java-publish-maven.yml with hardcoded tag
  java/v1.0.0-beta-10-java.5 for testing the cross-repo trigger

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: edburns

.github/workflows/PR-1524-test-java-publish-maven.yml

@@ -0,0 +1,26 @@
+# Temporary test workflow for PR #1524 — triggers site deployment on standalone repo.
+# Will be merged into java-publish-maven.yml once validated.
+name: "PR-1524: Test Site Deployment Trigger"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  deploy-site:
+    name: Deploy Documentation Site (Test)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger site deployment on standalone repo
+        run: |
+          VERSION="1.0.0-beta-10-java.5"
+          TAG="java/v${VERSION}"
+          echo "Triggering site deployment for version ${VERSION} (tag: ${TAG})"
+          gh workflow run deploy-site.yml \
+            --repo github/copilot-sdk-java \
+            -f version="${VERSION}" \
+            -f publish_as_latest=true \
+            -f monorepo_tag="${TAG}"
+          echo "### Site Deployment" >> $GITHUB_STEP_SUMMARY
+          echo "Triggered deploy-site.yml on github/copilot-sdk-java for version ${VERSION}" >> $GITHUB_STEP_SUMMARY
+        env:
+          GITHUB_TOKEN: ${{ secrets.JAVA_SITE_DEPLOY_TOKEN }}

.github/workflows/java-publish-maven.yml

@@ -287,3 +287,4 @@ jobs:
         run: gh workflow run release-changelog.lock.yml -f tag="java/v${{ needs.publish-maven.outputs.version }}"
         env:
           GITHUB_TOKEN: ${{ secrets.JAVA_RELEASE_GITHUB_TOKEN }}
+

java/pom.xml

@@ -615,8 +615,6 @@
         </plugins>
     </build>
 
-
-
     <profiles>
         <!-- Enable dynamic agent loading on JDK 21+ so Mockito/ByteBuddy
              can attach at runtime (JEP 451). The flag does not exist on