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/normalization_prefs.go

@@ -12,10 +12,9 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 )
 
-// NormalizationPrefs is one user's loudness-normalization preference (M464
-// #4998). It lives on the server so every player applies the same one: the
-// web player and the Android app read it, and the leveled stream for
-// UPnP/Sonos (#5001) renders with it.
+// NormalizationPrefs is one user's loudness-normalization preference. It lives
+// on the server so every player applies the same one: the web player and the
+// Android app read it, and the leveled stream for UPnP/Sonos renders with it.
 type NormalizationPrefs struct {
 	// Mode is off, auto, track or album. Auto uses album gain while an album
 	// plays in order and track gain otherwise.