docs(media): the music relayout is mid-flight, and the array takes one writer

The page said the music plan "was applied" while 62k of its 131k journal rows
were still being written; a runbook line that gets believed is worse than none.
Also lands the single-writer law the audiobook handoff exists to honour, and the
durable plan path (/tmp is not a record).

serverAppConfigs-docs/Dankserver/Media Relayout.md

@@ -295,12 +295,9 @@ What it refuses:
   rename to `.m4a` would claim it is; **audio no provider row names parks** too,
   because unmatched audio is a tagging job, not a renaming job.
 
-The plan was applied on 2026-10-31; its journal is
-`/mnt/entropy/media-relayout-music.jsonl` and its rollback is that journal run
-through `media-apply.py rollback --apply`. Whatever the tags could not name sits
-in `Music/_unsorted`, keeping the relative path it had, for a human to review:
-the pile is mostly sidecars in a folder holding two albums, plus audio no
-provider row names, which is a tagging job and not a renaming job.
+The plan applies on 2026-10-31 through `/mnt/entropy/media-relayout-music.jsonl`;
+its rollback is that journal run through `media-apply.py rollback --apply`. ONE
+writer at a time on this array: two rename passes race, and neither journal tells.
 
 ## The audiobook library's own relayout
 
@@ -356,6 +353,10 @@ no chapter row names, and a loose file in a folder holding two books all park un
 that unrelated books share, or a chapter number mistagged as the artist (`0.4`).
 `Various Artists` is not a placeholder — that is a multi-cast read.
 
+The plan stands reviewed at `/mnt/entropy/media-relayout-audiobooks-plan.tsv`
+(55,114 moves, 7,764 parked, executor preflight refused nothing); it applies on its
+own journal, behind the music writer, and then refreshes the Plex section.
+
 ## Laws
 
 - **A moved file is a 404 in [[Plex]] until its section is rescanned.** The