docs: server comments say what the code does, not how it came to be (#6277)

Comment blocks in cmd/minstrel and 30 smaller internal packages, rewritten
to rule 32's standard with each citation read in context: task, milestone
and rule ids go, and so do the stories they were attached to ("used to",
"Before #N", measurements from one install, quotes, pointers to Fabled
Librarian's records and to docs/superpowers files that are not in the
repo). Where a story wrapped a real constraint, the constraint stays as a
present-tense fact.

Comments that had gone stale are corrected:
- taste.Config: the tuned values are overlaid by internal/recsettings;
  it is no longer "a later follow-up".
- StorageConfig: the data dir holds art, caches and the stream secret,
  not only playlist covers.
- the Subsonic album list and getUser comments describe what they do
  today rather than a milestone that would change it.

Checked: the non-comment token stream of every changed file matches
HEAD, and gofmt -l is empty.

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

internal/prowlarr/prowlarr.go

@@ -1,9 +1,8 @@
-// Package prowlarr searches through Prowlarr's native API (M502 #5518).
-// Ported from Fabled Librarian's internal/prowlarr.
+// Package prowlarr searches through Prowlarr's native API.
 //
 // Native rather than Torznab because Prowlarr has no aggregate Torznab feed:
 // `/api/v1/indexer/all/newznab` 404s exactly like an indexer id that does not
-// exist (measured by Fabled Librarian against a real Prowlarr, its #4304).
+// exist.
 // `/api/v1/search` is the one place Prowlarr asks every indexer at once.
 package prowlarr