feat: url текущей страницы в ответе задачи (#116)

SPA меняет адрес без навигации (страница созданной заявки и т.п.): ответ v1/v2 отдаёт page.url
после действий, клиент 0.2.1 - Result.url. Документация и unit-тесты.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/conftest.py

@@ -21,6 +21,8 @@ class FakeContext:
 
 
 class FakePage:
+	url = "https://example.com/after-actions"
+
 	def __init__(self, context):
 		self.context = context
 

tests/unit/test_client.py

@@ -69,6 +69,7 @@ def test_run(rx, monkeypatch):
 	result = rx.run("https://example.com", [Action.inner_text("h1")], html=True)
 	assert result.ok and result.results == ["Example"]
 	assert result.html == "<body>page</body>" and result.user_agent == "UA/engine"
+	assert result.url == "https://example.com/after-actions"
 	assert result.cookie("cf_clearance") == "secret-cookie"
 	assert result.session_id
 

tests/unit/test_v1.py

@@ -25,6 +25,7 @@ def test_ok(env, monkeypatch):
 	assert data["status"] == "ok"
 	assert "code" not in data and "error" not in data
 	assert data["user_agent"] == "UA/engine"
+	assert data["url"] == "https://example.com/after-actions"
 	assert data["actions"] == [{"type": "wait_for", "ok": True, "duration_ms": 5}]
 	assert data["html"] == "<body>page</body>"
 	assert data["screenshot"] == "cG5n"  # base64(b"png")