chore: add playwright-java-release skill

.claude/skills/playwright-java-release/SKILL.md

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+---
+name: playwright-java-release
+description: Prepare a Playwright Java release after the rolling PR has merged — cut the release branch, mark the Maven version, draft the GitHub release, and tick the Java boxes in the internal checklist.
+---
+
+Use this skill once the `chore: roll driver to 1.X.0` PR has merged into `main` and the upstream JS `v1.X.0` is published. The rolling work itself is covered by the [[playwright-roll]] skill.
+
+Throughout this doc, replace `X` with the minor version (e.g. `60` for `1.60.0`) and `<user>` with the fork owner (`gh api user --jq .login`).
+
+The full release checklist lives in the private `microsoft/playwright-internal` repo as the `v1.X checklist` issue. Find its number once:
+
+```bash
+unset GITHUB_TOKEN
+ISSUE=$(gh search issues --repo microsoft/playwright-internal "v1.X checklist" --json number --jq '.[0].number')
+```
+
+Tick each Java box incrementally (one PATCH per item) so the issue reflects accurate state if the flow is interrupted:
+
+```bash
+gh api repos/microsoft/playwright-internal/issues/$ISSUE --jq '.body' > /tmp/body.md
+# edit /tmp/body.md to flip "- [ ]" → "- [x]" on the relevant Java item
+gh api repos/microsoft/playwright-internal/issues/$ISSUE -X PATCH --field body=@/tmp/body.md
+```
+
+## 1. Cut the release branch
+
+Push `release-1.X` from current `upstream/main` (which now contains the merged roll commit):
+
+```bash
+git fetch upstream main
+git push upstream upstream/main:refs/heads/release-1.X
+```
+
+## 2. Draft the GitHub release
+
+Generate the release notes from the upstream docs:
+
+```bash
+cd ~/playwright
+node utils/render_release_notes.mjs java 1.X > /tmp/v1.X.0-release-notes.md
+```
+
+The renderer leaves JS-isms that need fixing for Java. Apply these substitutions — the list is not exhaustive, eyeball the diff before publishing:
+
+- `toMatchAriaSnapshot()` → `matchesAriaSnapshot()`
+- `toHaveCSS()` → `hasCSS()` (and other `toHaveX` matchers → `hasX`)
+- `browser.on('context')` → `browser.onContext()`
+- `browserContext.on('download' | 'frameattached' | ...)` → `browserContext.onDownload()` / `onFrameAttached()` / …
+
+Create the draft directly against `release-1.X` — drafting against `main` and retargeting later is fragile because every `gh release edit` rotates the `untagged-<hash>` ID:
+
+```bash
+gh release create v1.X.0 --repo microsoft/playwright-java --draft \
+  --title "v1.X.0" --notes-file /tmp/v1.X.0-release-notes.md --target release-1.X
+```
+
+## 3. Bump the Maven version on the release branch
+
+Cut `mark-v-1.X.0` off `upstream/release-1.X`, run `set_maven_version.sh`, and PR back to the release branch:
+
+```bash
+git checkout -b mark-v-1.X.0 upstream/release-1.X
+./scripts/set_maven_version.sh 1.X.0
+git add -u
+git commit -m "chore: mark 1.X.0"
+git push -u origin mark-v-1.X.0
+gh pr create --repo microsoft/playwright-java --head <user>:mark-v-1.X.0 --base release-1.X \
+  --title "chore: mark 1.X.0" \
+  --body "Updates Maven version in all modules to \`1.X.0\` for the v1.X release."
+```
+
+`set_maven_version.sh` only invokes `mvn versions:set` on `pom.xml`, `tools/*/pom.xml`, and `examples/pom.xml`, but the root invocation cascades through the reactor, so the expected diff is 11 poms: root + `driver/` + `driver-bundle/` + `playwright/` (from the reactor cascade) + 6 under `tools/` + `examples/`, all flipping `1.<prev>.0-SNAPSHOT` → `1.X.0`. Any other file in the diff is a red flag.
+
+## 4. Publish
+
+The user publishes the draft release manually once the `mark-v-1.X.0` PR is merged. After publishing, CI pushes the artifacts to Maven Central and runs the Docker workflow automatically: https://github.com/microsoft/playwright-java/actions.