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/importer.go

@@ -64,11 +64,11 @@ type Importer struct {
 	Catalogue Catalogue
 	Printer   Printer
 	// Roots are the library's folders (the scan paths), read on every use
-	// because they change in Settings (#6129). New music is filed under the
+	// because they change in Settings. New music is filed under the
 	// one the settings name, or the first.
 	Roots func() []string
 	// DataDir is where cached art lives, for tidying an artist an upgrade
-	// leaves with nothing (#5524). Empty skips it.
+	// leaves with nothing. Empty skips it.
 	DataDir string
 	// ClientFor builds the download client a grab went to. Defaults to
 	// acquire.DownloadClientFor.
@@ -195,7 +195,7 @@ func (im *Importer) passClient(ctx context.Context, q *dbq.Queries, code string,
 		}
 		t, ok := byHash[indexer.NormalizeHash(g.InfoHash)]
 		if !ok {
-			continue // gone from the client: the lifecycle settles it (#5523)
+			continue // gone from the client: the lifecycle settles it
 		}
 		if !g.WantID.Valid {
 			wait(g, "Its album is no longer wanted.")