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/duplicate_classify_test.go

@@ -7,7 +7,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 )
 
-// The shapes measured on the operator's library (milestone 498's body).
+// The group shapes the classifier tells apart.
 func TestClassifyDuplicateGroup(t *testing.T) {
 	m := func(album, title string) ClassifyMember {
 		return ClassifyMember{AlbumID: album, Title: title, ArtistName: "Gorillaz"}
@@ -63,7 +63,8 @@ func TestMatchTitleKey(t *testing.T) {
 		{"Song (live)", "", "songlive"},
 		{"Song (demo)", "", "songdemo"},
 		{"Song (Remix)", "", "songremix"},
-		// A title that is nothing but a marker keeps its words rather than vanishing.
+		// A title that is nothing but a marker keeps its words rather than
+		// vanishing.
 		{"(Official Video)", "", "officialvideo"},
 	}
 	for _, tc := range cases {
@@ -73,8 +74,8 @@ func TestMatchTitleKey(t *testing.T) {
 	}
 }
 
-// Copies the fold of 2026-10-20 merged although their file names said they
-// were different versions; each pair must disagree. And copies of one version
+// Copies whose file names say they are different versions must disagree, so
+// the fold never merges them. And copies of one version
 // named differently must agree.
 func TestVersionWords(t *testing.T) {
 	differ := [][2][2]string{
@@ -149,7 +150,7 @@ func TestWrongSlots(t *testing.T) {
 }
 
 // The lengths cannot place a recording filed as several songs (Savant's
-// Mortals, cut to each slot's length); what AcoustID calls it can (#6169).
+// Mortals, cut to each slot's length); what AcoustID calls it can.
 func TestNamedCopies(t *testing.T) {
 	track := func(title string, ms int32, rec string) dbq.MbReleaseTrack {
 		return dbq.MbReleaseTrack{Title: title, LengthMs: ms, RecordingMbid: rec}