v0.4.2

Hot-fix over v0.4.1. The 0.4.1 wheel shipped only .py files + skill
markdown, but the runtime needs three other on-disk asset bundles: the
FastAPI static directory, the Jinja2 templates, and sql/sqlite/schema.sql
for the SQLite bootstrap. Without them, e2er run on a fresh
pip install e2er crashed at uvicorn startup with RuntimeError: Directory '.../src/api/static' does not exist.

Cross-lane

• Ship runtime assets in the wheel: pyproject.toml now declares
  src.api package-data (static/*, templates/*) and sql / sql.sqlite
  package-data (*.sql). Empty sql/__init__.py and sql/sqlite/__init__.py
  make sql/ discoverable by setuptools.packages.find. Verified by
  fresh-venv install + uvicorn src.api.app:app boot, GET /static/style.css
  serving 5,182 bytes, and an end-to-end e2er run reaching terminal
  failed status (cost-cap test) with ~/.e2er/papers.db and the
  workspace directory both created via the SQLite zero-config path.