Epic 5 — `nullstone` CLI — Azure Admin Platform

## Epic 5 — `nullstone` CLI — Azure Admin Platform

Interactive runtime access (`status`, `exec`, `ssh`, `run`) for Azure compute platforms. Follows the identical factory pattern as AWS and GCP admin providers.

**T-Shirt Size:** L
**Story Points:** 31 pts
**Estimated Hours:** ~69h

### Dependencies
Blocked on Story 2.3 (temp creds API). Fully parallel with Epic 4 once Epic 2 completes.