chore: scaffold tools/ package + stdlib http client

Per sub-project-2 plan Task 1. Adds tools/ to setuptools packages,
gitignores media/, and a minimal injectable urllib HTTP client.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -12,4 +12,8 @@ requires = ["setuptools>=68"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
-packages = ["hef"]
+packages = ["hef", "tools"]
+
+[project.scripts]
+hef-ingest = "tools.ingest_cli:main"
+hef-review = "tools.review_cli:main"