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/acquire/grab.go

@@ -16,12 +16,11 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/release"
 )
 
-// Taking a release (M502 #5521), ported from Fabled Librarian's grab.go and
-// rivals.go. One live grab per want: a second is tie-broken against the
-// download already running (FL #4470).
+// Taking a release. One live grab per want: a second is tie-broken against
+// the download already running.
 
-// Tag goes on every torrent Minstrel adds, so the operator can tell them
-// from their own in the client.
+// Tag goes on every torrent Minstrel adds, so they can be told apart from
+// anything else in the client.
 const Tag = "minstrel"
 
 // MissingClient is Taken.Missing when no download client is set up.
@@ -211,9 +210,9 @@ func (s *Service) Grab(ctx context.Context, want Want, chosen *Candidate, all []
 }
 
 // heldElsewhere reports whether a release the client says it already holds is
-// one it does not list for Minstrel: held under another category, from before
-// Minstrel took the downloads over (#6176). Recorded as a grab, it would read
-// as gone half an hour later and be taken again, every pass. A client that
+// one it does not list for Minstrel: held under another category. Recorded
+// as a grab, it would read as gone half an hour later and be taken again,
+// every pass. A client that
 // cannot answer now is given the benefit of the doubt, as the add was.
 func (s *Service) heldElsewhere(ctx context.Context, hash string) bool {
 	if hash == "" {