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/release/quality.go

@@ -44,7 +44,7 @@ var Tiers = []TierInfo{
 }
 
 // DefaultTiers is what a new install allows: every format from trash lossy
-// to lossless (note #5527). Unknown is left out; a
+// to lossless. Unknown is left out; a
 // release that names no format has its .torrent read to find out.
 var DefaultTiers = []Tier{
 	TierLosslessHiRes, TierLossless, TierLossyHigh, TierLossyStandard,
@@ -151,7 +151,7 @@ func khz(f float64) string {
 	return strings.TrimSuffix(strconv.FormatFloat(f, 'f', 1, 64), ".0")
 }
 
-// Profile is which tiers the operator takes.
+// Profile is which tiers an install takes.
 type Profile struct {
 	Allowed map[Tier]bool
 }
@@ -216,7 +216,7 @@ func FileKbps(bytes, ms int64) int {
 // mp3High is the average bitrate from which an MP3 counts as high quality
 // when only its size is known. A V0 encode averages 220 to 260 kbps, so the
 // line sits below it: an estimate errs toward the copy held, and an album is
-// never fetched again on a guess (#5524).
+// never fetched again on a guess.
 const mp3High = 220
 
 // TierOfFile places files of one format on the ladder from their average