- Replace `upgrade` stub with real command (alias for `self-update`)
- Also register `update` as alias: `unarr update` works too
- Rewrite `status` to show full config, disk usage, daemon state, and
update availability with colored sections
- Add version check cache (1h TTL) so `status` is instant on repeat runs
- Guard against division by zero on empty filesystems
- Guard against negative durations from clock skew
- Guard against stale PID via heartbeat recency check (2 min)
- Add comprehensive test coverage across agent, engine, upgrade, usenet,
arr, library, mediaserver, and UI packages
- Improve Makefile coverage target to exclude cmd/ glue code
- Fix stream handler resource cleanup and ffprobe error handling
Complete usenet download support for unarr CLI:
- NZB XML parser with password extraction from <head> meta
- yEnc decoder with CRC32 verification
- NNTP client with TLS, auth, and connection pool (up to 10 conns)
- Segment downloader with parallel workers and progress reporting
- Post-processing: par2 verify/repair, unrar/7z extraction with password support
- Agent client methods: SearchNzbs, DownloadNzb, GetUsenetCredentials
- UsenetDownloader implementing full Downloader interface
- Daemon wiring: UsenetDownloader passed to Manager
E2E tested: Oppenheimer 1080p (2.94 GB) downloaded via NNTP in 77.6s.
