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/pace.go

@@ -8,8 +8,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/indexer"
 )
 
-// SearchPace is the one Pacer every search shares, ported from Fabled
-// Librarian (#4448). Process-wide because a Fanout is built fresh for each
+// SearchPace is the one Pacer every search shares. Process-wide because a Fanout is built fresh for each
 // search; a Pacer per Fanout would start empty and pace nothing.
 var SearchPace = &Pacer{}
 
@@ -19,7 +18,7 @@ const holdWithoutRetryAfter = 10 * time.Minute
 
 // Pacer spaces the searches sent to each source by its searches_per_hour: a
 // spacing, not a burst bucket, because Prowlarr answers 429 to a few requests
-// in quick succession (FL #4304). Every search spends, the schedule's and a
+// in quick succession. Every search spends, the schedule's and a
 // person's alike; only the schedule waits.
 type Pacer struct {
 	// Now and Sleep are the clock, replaceable in tests.