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