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/reacquisition/settings.go

@@ -1,12 +1,11 @@
 // Package reacquisition wants an album back when its files go missing,
-// without anyone pressing anything (milestone #290; a want since M502
-// #5520).
+// without anyone pressing anything.
 //
 // The unit of work is the ALBUM, not the track. Music is acquired as
 // releases; there is no meaningful "fetch me one track", and a recording
 // MBID is something plenty of files lack. Grouping also does most of the
-// safety work: the loss that produced #2523 — three reorganised albums, ~40
-// missing files — becomes three wants rather than forty.
+// safety work: a reorganised album's forty missing files become one want,
+// not forty.
 package reacquisition
 
 import (
@@ -21,7 +20,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 )
 
-// Settings is the operator-tunable policy, mirroring the columns and CHECK
+// Settings is the admin-tunable policy, mirroring the columns and CHECK
 // ranges in migration 0056.
 type Settings struct {
 	Enabled    bool

internal/reacquisition/sweeper.go

@@ -15,8 +15,8 @@ import (
 )
 
 // Sweeper periodically wants back albums whose files have been missing past
-// the grace window (milestone #290, M502 #5520). Searching for them is the
-// search schedule's (#5521), which retries per want.
+// the grace window. Searching for them is the search schedule's, which
+// retries per want.
 //
 // Deliberately a periodic worker rather than a hook inside the scanner's
 // reconcile pass: reconcile runs inside a scan and re-runs often, and a
@@ -28,7 +28,7 @@ type Sweeper struct {
 	logger   *slog.Logger
 	tick     time.Duration
 	// releaseGroup names the MusicBrainz release group of a release id, for an
-	// album whose tags never carried one (#5241). Wants are kept by release
+	// album whose tags never carried one. Wants are kept by release
 	// group. A field so tests can stand in for MusicBrainz.
 	releaseGroup func(ctx context.Context, releaseMBID string) (string, error)
 }
@@ -79,7 +79,7 @@ func (s *Sweeper) SweepOnce(ctx context.Context) error {
 	q := dbq.New(s.pool)
 	var res PassResult
 	// Counted, not acted on: an album MusicBrainz cannot name is not a
-	// failure to retry, it is a permanent gap the operator should see.
+	// failure to retry, it is a permanent gap an admin should see.
 	if n, cerr := q.CountAlbumsMissingWithoutMbid(ctx); cerr == nil {
 		res.Unnameable = n
 	}

internal/reacquisition/sweeper_test.go

@@ -83,9 +83,9 @@ func heldWant(t *testing.T, pool *pgxpool.Pool, group string, album pgtype.UUID,
 	}
 }
 
-// Only an album on the wanted list is fetched back (#5567): one taken off
-// it, or dropped into the library by hand, is not. An album on the list is
-// wanted by its release group, never its release id (#5241): a tag-supplied
+// Only an album on the wanted list is fetched back: one taken off it, or
+// dropped into the library by hand, is not. An album on the list is wanted
+// by its release group, never its release id: a tag-supplied
 // group is used as is; otherwise MusicBrainz names it and the answer is
 // cached onto the album; an album MusicBrainz cannot name is skipped and
 // tried again next pass.
@@ -103,8 +103,7 @@ func TestSweep_WantsBackOnlyAlbumsOnTheList_Integration(t *testing.T) {
 	resolved := lostAlbum(t, pool, "Resolved", "release-resolved", "")
 	unknown := lostAlbum(t, pool, "Unknown", "release-unknown", "")
 	_ = lostAlbum(t, pool, "Off The List", "release-off", "group-off")
-	// Matched to a group with no release id: 238 such albums on the operator's
-	// library were never wanted back (#6167).
+	// Matched to a group with no release id: still wanted back.
 	groupOnly := lostAlbum(t, pool, "Group Only", "", "group-only")
 	heldWant(t, pool, "group-tagged", tagged, "3 days")
 	heldWant(t, pool, "group-only", groupOnly, "3 days")
@@ -165,7 +164,7 @@ func TestSweep_WantsBackOnlyAlbumsOnTheList_Integration(t *testing.T) {
 }
 
 // A want held after the files went missing means the library has a full copy
-// despite the missing rows (#5245): the album is not wanted again. One held
+// despite the missing rows: the album is not wanted again. One held
 // before they went missing is reopened.
 func TestSweep_HeldWantsAreReopenedOnlyForANewLoss_Integration(t *testing.T) {
 	pool := newSweepPool(t)