Versioned resource releases

Each bundle provides a manifest and checksum-backed public teaching downloads. Earlier releases remain visible as history.

• Ubuntu Cloud Skills Companion Materials — v0.1.0 — 2 pinned files.
• Practical Statistics with Python — Companion Course Case Study — v0.1.0 — 2 pinned files.
• Practical Statistics with Python — Companion Course Case Study — v0.2.0 — 7 pinned files.