docs(media): one page for the metadata view, and the three pages it re-points

New owner page Dankserver/Media Metadata View.md: the shape, the two binds and
why Plex keeps the /mnt/entropy container path, the commands, the laws (SSD-only
upper layer, never mount over an unmounted array, never delete through the view
because a whiteout only hides the array's copy, reap after any relayout, inotify
does not cross the merge), the failure signatures, and the rollback.

Jellyfin.md: /data is the view, so Local metadata works; the
"Read-only file system : '/data/…/movie.nfo'" line that used to be expected noise
is now the signature of a missing view. Plex.md: same bind, one fact changed.
Media Relayout.md: two new laws for the metadata that does not follow a rename.
AGENTS.md: runbook-index row plus a summary row. Root index regenerated.

AGENTS.md

@@ -808,6 +808,7 @@ per-attempt page and no per-swap ledger anywhere else.
 | Dankclaw kernel posture (`iommu=pt` since 2026-10-18) | `serverAppConfigs-docs/LLM/dankclaw-iommu-translation-off.md` |
 | Deployment flow | `serverAppConfigs-docs/Architecture/Deployment Flow.md` |
 | Movie-library relayout (Jellyfin format, Dankserver) | `serverAppConfigs-docs/Dankserver/Media Relayout.md` |
+| SSD-backed metadata view (Jellyfin writes, Plex reads, Dankserver) | `serverAppConfigs-docs/Dankserver/Media Metadata View.md` |
 
 There is no page for a retired endpoint and no change diary. A payload swap
 appends one row to the live endpoint's **Eras** table; when the endpoint itself
@@ -850,5 +851,6 @@ history.
 | Benchmarking (only when ordered) | **Stop and mask the service first**, bench, unmask, restart, verify health. |
 | Deleting a file | **Move it to trash** — `.AGENTTRASH/` (in-repo) or `~/.AGENTTRASH/YYYYMMDD-topic`. Never `rm`. |
 | Relayout the movie library | **Census → plan → read the exceptions → `scripts/media-apply.py`** — renames only, journal before every move; never hand-rename, never copy. |
+| Making media metadata visible to both media servers | **Bind `/mnt/media`** — the overlay `scripts/media-view.sh` installs (array below, NVMe above). Never write the array; never delete through the view. |
 | Tests exist | **Run them** — verify tests pass after every change. Do not commit failing tests. |
 | Real secrets | **Never commit** — host `.env` files; `.env.example` holds placeholders only. |