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/requests/reconciler.go

@@ -36,8 +36,8 @@ func NewReconciler(pool *pgxpool.Pool, logger *slog.Logger, bus *eventbus.Bus) *
 	return &Reconciler{pool: pool, logger: logger, bus: bus, tick: 5 * time.Minute, batch: 50}
 }
 
-// SetNotifier makes completions land in the requester's notifications inbox
-// (M489). Without one, completions are only broadcast on the bus.
+// SetNotifier makes completions land in the requester's notifications inbox.
+// Without one, completions are only broadcast on the bus.
 func (r *Reconciler) SetNotifier(n *notifications.Notifier) { r.notifier = n }
 
 // publishCompleted tells the requester their request arrived: a

internal/requests/service.go

@@ -1,6 +1,6 @@
 // Package requests owns the lifecycle of what users ask to have added. The
 // synchronous Service handles Create/List/Approve/Reject/Cancel; approving
-// records the request on the wanted list (M502 #5520): an album or a track
+// records the request on the wanted list: an album or a track
 // wants its album's release group, an artist is followed. The async
 // Reconciler (separate file) completes approved requests once the library
 // holds what they asked for.
@@ -60,7 +60,7 @@ func (s *Service) Create(ctx context.Context, userID pgtype.UUID, p CreateParams
 
 // CreateTracked is Create, also reporting whether a row was inserted. A
 // request that dedupes into one already in flight is not new, so callers
-// that announce new requests (M489) say nothing for it.
+// that announce new requests say nothing for it.
 func (s *Service) CreateTracked(ctx context.Context, userID pgtype.UUID, p CreateParams) (dbq.Request, bool, error) {
 	if err := validateKindFields(p); err != nil {
 		return dbq.Request{}, false, err