docs: library comments say what the scanner and resolver do, not how they came to be (#6277)

Rewrites the internal/library comment blocks to rule 32. Task, milestone,
decision and rule ids are gone; the incidents behind them are restated as
the constraint they left (why a file is deleted before its row, why the
missing mark is a mark, why duplicates block on duration). Counts and
album names from one library are dropped from production comments; test
comments keep the names their fixtures use. The tagReadVersion log keeps
each version's before and after, without the measurements.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/library/loudness_settings.go

@@ -12,9 +12,9 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 )
 
-// Loudness analysis settings (M464 #4995). Rule 25: an operator setting is a
-// database row, changed without a restart. One instance is shared by the
-// backfill and the admin API, so a save reaches the worker at once.
+// Loudness analysis settings: a database row, changed without a restart. One
+// instance is shared by the backfill and the admin API, so a save reaches the
+// worker at once.
 
 // LoudnessSettings mirrors the loudness_settings row.
 type LoudnessSettings struct {
@@ -23,14 +23,15 @@ type LoudnessSettings struct {
 	Enabled             bool
 	BackfillConcurrency int32
 	// LeveledCacheMB caps the disk the leveled-stream renders for Sonos and
-	// UPnP speakers may use (#5001); the least recently played go first.
+	// UPnP speakers may use; the least recently played go first.
 	LeveledCacheMB int32
 	// UpdatedAt is set by the database; ignored by Set.
 	UpdatedAt time.Time
 }
 
-// DefaultLoudnessSettings mirrors migrations 0065 and 0068's column defaults, so a
-// database that cannot be read still analyzes the way a fresh install does.
+// DefaultLoudnessSettings mirrors migrations 0065 and 0068's column defaults,
+// so a database that cannot be read still analyzes the way a fresh install
+// does.
 var DefaultLoudnessSettings = LoudnessSettings{
 	Enabled:             true,
 	BackfillConcurrency: loudnessBackfillConcurrency,