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/importer/verify.go

@@ -1,13 +1,11 @@
 // Package importer checks a finished download against the album it was
-// grabbed for and files it into the library (M502 #5522). Nothing reaches
+// grabbed for and files it into the library. Nothing reaches
 // the library before the check says the files are the album: a wrong album,
 // another version of it, a video rip or an incomplete copy is refused, its
 // release is blocked and the album is searched for again.
 //
-// Ported from Fabled Librarian's importer and relocate packages, with the
-// check rewritten for music: the files are matched to one of the album's
-// MusicBrainz editions by AcoustID fingerprints, track lengths, titles and
-// the tags they carry.
+// The files are matched to one of the album's MusicBrainz editions by
+// AcoustID fingerprints, track lengths, titles and the tags they carry.
 package importer
 
 import (
@@ -67,7 +65,7 @@ type File struct {
 	RecordingMBID string
 	LengthMs      int
 	// Recordings are the MusicBrainz recordings AcoustID says the audio is,
-	// at or above the operator's minimum score.
+	// at or above the configured minimum score.
 	Recordings []string
 	// Video: the file name says it is a music video, a lyric video or the
 	// like (library.SourceMarkersFor).
@@ -113,7 +111,7 @@ type Want struct {
 	Year           int
 	PrimaryType    string
 	SecondaryTypes []string
-	// Upgrade: a held album wanted for a better copy (#5524), quality or
+	// Upgrade: a held album wanted for a better copy, quality or
 	// rip; AlbumID is the library album it holds, whose tracks the import
 	// replaces.
 	Upgrade string