Merge lab into test/document-module-set-helper

Resolve the overlap with #19 by preserving the whole-cascade stylesheet
helpers alongside #31's document-source/module-set helpers.

Maintainer validation:
- document/module contract and composition guards: 15 passed
- all 54 touched Python test modules: 366 passed
- py_compile: clean
- git diff --check: clean

tests/test_document_rich_input_rules.py

@@ -5,6 +5,7 @@ import subprocess
 from pathlib import Path
 
 from tests.helpers.stylesheets import app_css
+from tests.helpers.stylesheets import stylesheet_link_tags
 from tests.helpers.document_source import document_source
 
 
@@ -29,7 +30,7 @@ def test_typing_markers_converts_blocks_and_preserves_following_text():
       const browser = await chromium.launch({ headless: true });
       const page = await browser.newPage({ viewport: { width: 900, height: 700 } });
       await page.goto(`${process.env.ODYSSEUS_TEST_STATIC_ORIGIN}/static/js/documentOutline.js`);
-      await page.setContent('<link rel="stylesheet" href="/static/style.css?v=20260831richtexttools91"><div id="toast"></div><div id="chat-container"></div><div id="sidebar"></div>');
+      await page.setContent('__ODY_STYLESHEETS__<div id="toast"></div><div id="chat-container"></div><div id="sidebar"></div>');
       await page.evaluate(async () => {
         const mod = await import('/static/js/document.js?v=20260831richtexttools91&input-rules-test=1');
         mod.init('/api');
@@ -102,6 +103,7 @@ def test_typing_markers_converts_blocks_and_preserves_following_text():
       console.log(JSON.stringify(data));
       await browser.close();
     """
+    script = script.replace("__ODY_STYLESHEETS__", stylesheet_link_tags())
     result = subprocess.run(
         ["node", "--input-type=module", "-e", script],
         cwd=ROOT,