Add writer deps (httpx, bs4) to dev dependencies for CI

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: BirdInTheTree

pyproject.toml

@@ -51,6 +51,8 @@ dev = [
     "pytest>=8.0",
     "pytest-asyncio>=0.24",
     "python-dotenv>=1.0",
+    "httpx>=0.27",
+    "beautifulsoup4>=4.12",
 ]
 
 [project.scripts]