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/logging/logging.go

@@ -23,7 +23,7 @@ func New(w io.Writer, level, format string) (*slog.Logger, error) {
 	default:
 		return nil, fmt.Errorf("unknown log format %q (want text|json)", format)
 	}
-	// Errors are also kept for the admin Overview (M504).
+	// Errors are also kept for the admin Overview.
 	return slog.New(newRingHandler(h, Errors)), nil
 }
 

internal/logging/recent.go

@@ -9,7 +9,7 @@ import (
 	"time"
 )
 
-// The server's recent errors, kept in memory for the admin Overview (M504):
+// The server's recent errors, kept in memory for the admin Overview:
 // what has gone wrong since the process started, without reading the
 // container's logs. Only ERROR and above, and only the newest few; the full
 // record is still the log stream.