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/place.go

@@ -40,9 +40,9 @@ type Tags struct {
 // gets the plain names only.
 //
 // A Vorbis track or disc number is the number alone, its count in
-// TRACKTOTAL and DISCTOTAL, as Picard writes them: dhowden/tag reads
-// TRACKNUMBER "3/20" as 0, and every album imported before #6171 lost its
-// order that way. ID3 and MP4 take "3/20", which their readers parse.
+// TRACKTOTAL and DISCTOTAL, as Picard writes them: dhowden/tag reads a
+// TRACKNUMBER of "3/20" as 0, which would lose the album's order. ID3 and MP4
+// take "3/20", which their readers parse.
 func (t Tags) args(ext string) []string {
 	vorbis := ext == ".flac" || ext == ".ogg" || ext == ".opus"
 	track, disc := ofN(t.Track, t.Tracks), ofN(t.Disc, t.Discs)
@@ -111,7 +111,7 @@ func Place(ctx context.Context, src, dst string, t Tags) (tagged bool, err error
 	return placeFile(ctx, src, dst, t, false)
 }
 
-// Overwrite is Place onto a file an upgrade replaces (#5524): the new copy
+// Overwrite is Place onto a file an upgrade replaces: the new copy
 // takes the old one's path in one rename, so the library never sees the
 // path empty, and the track row at that path, history and all, carries on
 // with the new file.