Share page-check helpers in tests/page_check_common.py

MODES, TEST_FILL, FAKE_BRIDGE, the stub loader, the page opener and the no-AI case list now live in one place; sample_data and push move to tests/conftest.py.

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

tests/conftest.py

@@ -1,6 +1,8 @@
-"""Shared by both page checks: one headless Chromium for the whole run
-(Playwright's sync API allows only one instance per process)."""
+"""Shared by the page checks: one headless Chromium for the whole run
+(Playwright's sync API allows only one instance per process), and the fixtures
+that don't depend on which page is under test."""
 import pytest
+from page_check_common import WIRED, push_to
 from playwright.sync_api import sync_playwright
 
 
@@ -10,3 +12,16 @@ def browser():
         b = p.chromium.launch()
         yield b
         b.close()
+
+
+@pytest.fixture
+def sample_data():
+    """Use on cases that need the page's own sample data; they skip on a bot-wired page."""
+    if WIRED:
+        pytest.skip("page is wired to a bot, so it has no sample data")
+
+
+@pytest.fixture
+def push(page):
+    """push(event, data): send one contract envelope to the page, as the bot would."""
+    return lambda event, data: push_to(page, event, data)