Spots: the spotter and the spot inspector, passwords kept apart

Two processes, one NNTP connection each (the coordinator 40 -> 38):
- spots:read (service spotter): free.pt's overviews after the last article
  seen, each spot's full header verified (lib/spotnet from voyager 1, as
  Spotweb), its description, website and NZB articles; the password its
  title or text names; delete/dispose messages applied.
- spots:inspect (service spot-inspector): each spot's compressed NZB read,
  its files listed (spot_files), each matched to the header pass's release
  by the same release identity in one of its groups within 48 h
  (release_spots); unmatched spots matched again hourly, after 24 h a
  release of their own (source spot) with the spot's NZB.
- release_passwords: per release and password, its source (nzb, spot-title,
  spot-text) and spot; the catalog keeps only passworded.
XoverClient.head(); PROBE_CONNECTIONS default 10.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/README.md

@@ -20,6 +20,8 @@ homelab with the deploy key, whose forced command
 | `coordinator` | `usenet-rebuild` | prefetching (all NNTP connections), planning, the tail, merging, settling |
 | `prober` | `usenet-rebuild` | phase 2: reads the probe queue's articles over `PROBE_CONNECTIONS` (6) connections, stores what they show |
 | `merger` | `usenet-rebuild` | the par2 merge: releases whose files one par2 set describes become one (no NNTP) |
+| `spotter` | `usenet-rebuild` | Spotnet: free.pt's spots into `spots`, signatures checked, the passwords they name kept; 1 connection |
+| `spot-inspector` | `usenet-rebuild` | each spot's NZB: its files in `spot_files`, linked to the releases they match (`release_spots`), passwords in `release_passwords`; 1 connection |
 | `edge` | `usenet-rebuild-edge` (target `edge`) | the Rust worker, `--threads $EDGE_THREADS` (8) |
 | `edge-ts` | `usenet-rebuild` | the TypeScript worker, profile `edge-ts`, not started |
 | `ace` | `usenet-rebuild` | one-off ace commands, profile `tools` |