feat(java): add Playwright Java examples for axe Watcher 4.4.0

[Garbee]

Watcher 4.4.0 adds Playwright Java support, so this adds runnable
JUnit 5 example projects mirroring the existing java/selenium layout.

Three Maven projects under java/playwright cover the integration's core
scenarios: basic (auto analysis via wrapPage), manual-mode
(setAutoAnalyze(false) with analyze/start/stop), and context-wrapping
(wrapContext so every page from one BrowserContext is instrumented).
Each depends on com.microsoft.playwright:playwright 1.60.0 and
com.deque.axe_core:watcher 4.4.0, reads API_KEY/PROJECT_ID/SERVER_URL
from the environment like the rest of the repo, and drives
the-internet.herokuapp.com.

A new java-smoke-tests job in the Tests workflow keeps the samples
green: it sets up Temurin 17, installs Chrome via the existing
install-chrome action, and runs mvn -B test against each project. The
examples launch headless with an explicit Chromium-based channel (chrome

• CHROME_BIN in CI, bundled chromium locally) because axe Watcher's
  extension cannot load in classic/default headless mode; this mirrors the
  watcher package's own Playwright e2e setup, including
  PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD so CI reuses the runner's Chrome rather
  than downloading a browser. java/playwright/README.md documents
  prerequisites and run steps, the root README points to it, and a
  top-level permissions: contents: read is added to the workflow.

The example projects build with Java 11 (a modern LTS) rather than 8;
the axe Watcher integration itself supports Java 8+, which the README
notes. Supply-chain hardening of the Maven step (checksum/lock,
environment-gated secrets) is intentionally left to match the existing
JS smoke-tests job rather than expanded here.

QA Notes

From an example directory (e.g. java/playwright/basic), with API_KEY and
PROJECT_ID exported, run mvn test and confirm the suite passes and a
page state appears in the axe Developer Hub project. Without CHROME_BIN
set, first run mvn exec:java -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="install chromium".

Niche cases to exercise manually:

• No CHROME_BIN: the example falls back to channel "chromium"
  (Playwright's bundled browser) -- verify it still launches.
• Missing credentials (e.g. a fork PR without secrets): the run reaches
  flush() and fails at upload, not at setup.
• setHeadless(false): confirm the test runs in a visible window.

Closes: #274

[Copilot]

Pull request overview

Adds runnable Playwright Java + JUnit 5 example projects for axe Watcher 4.4.0, mirroring the existing Java/Selenium examples, and wires them into CI via a new Java smoke-test job.

Changes:

• Add three Maven/JUnit 5 Playwright Java sample projects (basic auto-analysis, manual mode, context wrapping).
• Add documentation for running the new Playwright Java samples and link to it from the root README.
• Extend the GitHub Actions test workflow with a Java smoke-test matrix.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
README.md	Links to the new Java/Playwright examples and explains Maven-based execution.
java/playwright/README.md	Documents prerequisites and run steps for the Playwright Java sample projects.
java/playwright/basic/src/test/java/com/deque/watcher_examples/playwright/BasicTest.java	Basic auto-analysis example using wrapPage() and per-test flush.
java/playwright/manual-mode/src/test/java/com/deque/watcher_examples/playwright/ManualModeTest.java	Manual mode example using setAutoAnalyze(false) with explicit analyze/start/stop.
java/playwright/context-wrapping/src/test/java/com/deque/watcher_examples/playwright/ContextWrappingTest.java	Context-wrapping example using wrapContext() and multi-page navigation.
java/playwright/basic/pom.xml	Maven config for the basic Playwright Java example (Playwright + watcher + JUnit).
java/playwright/manual-mode/pom.xml	Maven config for the manual-mode Playwright Java example.
java/playwright/context-wrapping/pom.xml	Maven config for the context-wrapping Playwright Java example.
.github/workflows/test.yml	Adds workflow permissions and a new java-smoke-tests matrix job running mvn test.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

[scottmries]

I would take this over the other PR with these tests, but can we include its MultiPageTest, too?

Updated

[Garbee]

Lint is just the JS side. So I'm bypassing this since the lint check failed to run. Going to fix that separately with a new event. And probably add Java linting as well so all that is consistent too.