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/taste/profile.go

@@ -1,7 +1,7 @@
 // profile.go assembles the per-user taste profile from graded play
 // engagement (decayed over time) plus explicit-like bonuses, and
-// atomic-replaces the taste_profile_* tables. Phase 1 only builds the
-// object; candidate sourcing + scoring consume it in phase 2.
+// atomic-replaces the taste_profile_* tables, which candidate sourcing and
+// scoring read.
 package taste
 
 import (
@@ -19,9 +19,8 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/mood"
 )
 
-// Config holds the operator-tunable knobs. DefaultConfig supplies tuned
-// starting values; wiring these into the server RecommendationConfig is a
-// later follow-up (phase 1 uses the defaults).
+// Config holds the tunable knobs. DefaultConfig supplies the shipped values;
+// internal/recsettings overlays what an admin has tuned.
 type Config struct {
 	Engagement EngagementParams
 
@@ -37,8 +36,8 @@ type Config struct {
 	TrackLikeBonus  float64
 	TagLikeBonus    float64
 
-	// EnrichedTagScale weights folksonomy tags (from the track_tags cache,
-	// #1490) relative to a track's raw ID3 genre when both fold into the tag
+	// EnrichedTagScale weights folksonomy tags (from the track_tags cache)
+	// relative to a track's raw ID3 genre when both fold into the tag
 	// facet. Each enriched tag contributes base × tag.weight × this scale,
 	// where base is the play's decayed engagement (or the tag-like bonus for
 	// a liked track) and tag.weight is the normalized folksonomy strength in
@@ -47,19 +46,19 @@ type Config struct {
 	// contribution entirely (falls back to genre-only).
 	EnrichedTagScale float64
 
-	// EraScale weights the decade/era facet (#1530): each play adds
+	// EraScale weights the decade/era facet: each play adds
 	// base × this scale to its album's decade bucket ("1990s"), where base
 	// is the decayed engagement (or the tag-like bonus for a liked track).
 	// Era is a coarse signal, so it's kept ≤ 1 to imprint at most as strongly
-	// as the raw engagement; 0 disables the era facet entirely. Tunable in the
-	// lab (mirrors EnrichedTagScale, #1520).
+	// as the raw engagement; 0 disables the era facet entirely. Tunable in
+	// Admin › Tuning.
 	EraScale float64
 
-	// MoodScale weights the mood facet (#1534): each play adds base × this
+	// MoodScale weights the mood facet: each play adds base × this
 	// scale to the canonical mood buckets (melancholic / chill / …) derived
 	// from its enriched folksonomy tags via internal/mood. Coverage is partial
 	// (depends on tag enrichment), so it's a supplement kept ≤ 1; 0 disables
-	// the mood facet entirely. Tunable in the lab (mirrors EraScale).
+	// the mood facet entirely. Tunable in Admin › Tuning.
 	MoodScale float64
 
 	// ArtistFloor / TagFloor clamp how negative a single entity's weight may
@@ -166,7 +165,7 @@ func accumulate(
 	if err != nil {
 		return nil, nil, nil, nil, fmt.Errorf("taste: load play engagement: %w", err)
 	}
-	// Enriched folksonomy tags keyed by track (#1490) — folded into the tag
+	// Enriched folksonomy tags keyed by track, folded into the tag
 	// facet alongside raw ID3 genre so a coarse "Rock" gains the cached
 	// "post-punk / shoegaze / melancholic" vocabulary. Window matches the
 	// play window; a track with no cached tags simply contributes genre only.