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/downloader/driver.go

@@ -1,6 +1,5 @@
-// Package downloader drives the download clients Minstrel hands a grab to
-// (M502 #5518): qBittorrent's WebUI v2, and FabledExchange's native
-// /api/downloads. Ported from Fabled Librarian's internal/downloader.
+// Package downloader drives the download clients Minstrel hands a grab to:
+// qBittorrent's WebUI v2, and FabledExchange's native /api/downloads.
 //
 // Both answer through one Driver, and Torrent is qBittorrent's shape: the
 // Exchange driver maps its own downloads onto it, so the grab, the importer
@@ -58,7 +57,7 @@ type Config struct {
 	// APIKey is Exchange's, sent as a bearer only when set.
 	APIKey string
 	// Category files everything Minstrel adds, so its torrents can be told
-	// from the operator's own.
+	// from anything else in the client.
 	Category string
 	Timeout  time.Duration
 }