docs(media): the metadata view is live, and duplicate pruning gets a page

`Media Metadata View.md` said "Not deployed on Dankserver — verified
2026-10-31". That was true yesterday and is false now: the overlay is mounted
and both installed quadlets bind it (`view:/data` rw for Jellyfin,
`view:/mnt/entropy:ro` for Plex). The page now states the live shape and the
order that proves it — `media-view.sh verify`, then the `Volume=` lines —
because the whole point of the page is to answer "is the view really serving?".
`AGENTS.md` carried the same stale claim in its summary table.

`Media Duplicate Prune.md` is new: the screen ladder (size, then head+tail
blake2b, then a sparse-window confirmation before anything moves), which copy
survives and why, the guards that each encode a file that would otherwise have
been destroyed (qBittorrent `.!qB` state, year-required with digits kept,
feature length, disc/part exclusion, media containers only), and the law that a
hold on the same volume frees nothing until it is purged. It also carries the
different way `media-verify.py` has to be READ for a prune — `landed: 0` is the
correct end state because no server may index the hold — and the planner bug
that class explains: when the planner re-derived "largest wins" from the hold
list alone it dropped every keeper out of its own group and pruned 17 files
instead of 205.

`Media Relayout.md` keeps a one-line pointer; carrying the whole procedure there
pushed it past the vault's 500-line ceiling, which is the linter telling the
truth about progressive disclosure.

serverAppConfigs-docs/index.md

@@ -51,6 +51,7 @@ is a locator: one row, one clause, no numbers.
 | [[Entropy Volume]] | The Dankserver entropy volume is a RAID-backed LUKS filesystem mounted at |
 | [[Jellyfin]] | Jellyfin on Dankserver: quadlet unit, overlay metadata view, provider keys, ports, access, transcode status. |
 | [[mariadb]] | The MariaDB backend for RomM: quadlet unit, network alias, env-file secret handling, and the backup path. |
+| [[Media Duplicate Prune]] | Find and hold duplicate films on the entropy array: the hash ladder, the keep rules, the guards, the purge. |
 | [[Media Metadata View]] | The SSD-backed overlay the two media servers read and write: shape, guards, commands, laws, rollback. |
 | [[Media Relayout]] | Census, plan and apply the movie, TV, music and audiobook libraries: the gates, the refusals, the rollback. |
 | [[Plex]] | Plex Media Server is a **containerized media server on Dankserver**: a podman |