feat: Playwright browser wrapper with compact snapshot

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_browser.py

@@ -0,0 +1,23 @@
+import pytest
+
+playwright = pytest.importorskip("playwright.sync_api")
+
+from auto_reverse.browser import Browser  # noqa: E402
+
+
+@pytest.fixture
+def browser():
+    try:
+        b = Browser(proxy_port=None, headless=True)
+        b.start()
+    except Exception as exc:  # browser binary missing, etc.
+        pytest.skip(f"browser unavailable: {exc}")
+    yield b
+    b.stop()
+
+
+def test_navigate_and_snapshot(browser, fixture_site):
+    browser.navigate(fixture_site + "/")
+    snap = browser.snapshot()
+    assert snap["url"].endswith("/")
+    assert "title" in snap