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/lifecycle/lifecycle.go

@@ -1,6 +1,4 @@
-// Package lifecycle looks after a download from the grab to its removal
-// (M502 #5523), ported from Fabled Librarian's internal/health and its seed
-// release (System 104).
+// Package lifecycle looks after a download from the grab to its removal.
 //
 //   - A download the client has failed is given up at once.
 //   - One nobody has shared, or still fetching its file list, after the
@@ -75,7 +73,7 @@ const (
 	// goneAfter: a client restarting can answer without a download for a
 	// while; half an hour missing is gone.
 	goneAfter = 30 * time.Minute
-	// goneWindow: a release gone twice within it is held back (#6176).
+	// goneWindow: a release gone twice within it is held back.
 	goneWindow = 7 * 24 * time.Hour
 )
 
@@ -335,7 +333,7 @@ func (s *Service) judge(ctx context.Context, q *dbq.Queries, d downloader.Driver
 	}
 
 	// The client's own verdict, given up on at once: it has already made
-	// the decision a retry would ask about (FL #4749).
+	// the decision a retry would ask about.
 	if t.Failed() {
 		why := t.FailReason
 		if why == "" {
@@ -445,8 +443,8 @@ func (s *Service) giveUp(ctx context.Context, q *dbq.Queries, d downloader.Drive
 // endGone ends a grab whose download left the client, and searches again.
 // The first time, the release is not held back: nothing was found wrong with
 // it. A release that leaves its client again within goneWindow is held back for
-// acquire.GoneBlock (#6176): whatever keeps the client from listing it, taking
-// it again on every pass found 38 grabs of one release in a day.
+// acquire.GoneBlock: whatever keeps the client from listing it would otherwise
+// have it taken again on every pass.
 func (s *Service) endGone(ctx context.Context, q *dbq.Queries, g dbq.ListLiveGrabsRow, rep *Report) {
 	detail := "The download client no longer lists it: removed outside Minstrel. The album is searched for again."
 	before, err := q.CountGoneGrabs(ctx, dbq.CountGoneGrabsParams{