Add catalog refresh to self-update monthly torrent hashes#8
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The monthly dump hashes were a compiled-in map, so each new month needed a code edit and rebuild. Add `arctic catalog refresh`: it fetches the arctic_shift GitHub releases, pulls each month's comment/submission dump hash from the Academic Torrents link (or magnet), and caches new months to catalog-monthly.json under the data dir. Startup layers that cache over the built-in map, so a running binary resolves dumps published after it was built. The parser only accepts a release that names a month, carries a 40-hex hash, and references that month's RC_/RS_ files, so subreddit-metadata and tooling releases are ignored. A refresh against the live releases reports every current month as already known through 2026-06.
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The monthly dump hashes lived in a compiled-in map, so every new month meant a code edit plus a rebuild. This adds
arctic catalog refreshso the CLI keeps itself current.btih), and caches new months tocatalog-monthly.jsonunder the data dir.RC_/RS_dump files, so subreddit-metadata and tooling releases are skipped.--dry-runreports new months without writing the cache.Verified against the live releases: every current month resolves as already known through 2026-06 (the newest published, Jul 12), and every fetched hash matches the compiled catalog exactly. Full suite + vet green.