Skills from clawhub.ai/finnbusse

This skill is an HTTP client for IServ school platforms providing mail, calendar, files, messenger, and exercise operations. It reads credentials from `ISERV_BASE_URL`, `ISERV_USER`, and `ISERV_PASS`, performs network calls to `IServ` endpoints (e.g. `https://grabbe-dt.de`), and includes CLI usage like `./iserv.py`.

This skill provides a CLI `webuntis.py` that fetches student timetables from WebUntis (examples: `https://xyz.webuntis.com`, `https://example.webuntis.com`). It reads credentials from env vars such as `WEBUNTIS_PASS` and issues JSON-RPC POSTs to `.../WebUntis/jsonrpc.do` (purpose-aligned network and credential use).