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_sweep_test.go

@@ -37,8 +37,9 @@ func TestCoveredByDismissal(t *testing.T) {
 	}
 }
 
-// TestDuplicateSweep_Integration pins what the sweep proposes, what it leaves out,
-// and how re-sweeping treats a dismissal and a proposal that no longer holds.
+// TestDuplicateSweep_Integration pins what the sweep proposes, what it leaves
+// out, and how re-sweeping treats a dismissal and a proposal that no longer
+// holds.
 func TestDuplicateSweep_Integration(t *testing.T) {
 	pool := newPool(t)
 	ctx := context.Background()
@@ -175,9 +176,10 @@ func TestDuplicateSweep_Integration(t *testing.T) {
 		t.Fatalf("latest sweep = %+v, want finished without error", last)
 	}
 
-	// 5. Prints taken at another length are never compared (#3913). Every print
-	// here was taken at the default length, so a sweep at 60s has nothing to read,
-	// rather than scoring 120s prints against each other as if they were 60s ones.
+	// 5. Prints taken at another length are never compared. Every print
+	// here was taken at the default length, so a sweep at 60s has nothing to
+	// read, rather than scoring 120s prints against each other as if they were
+	// 60s ones.
 	atOtherLength := DefaultFingerprintSettings
 	atOtherLength.ChromaprintLengthSec = 60
 	res, err = runDuplicateSweep(ctx, pool, logger, atOtherLength, duplicateCandidatePage)