docs: query comments say what each query selects and why, not how it came to be (#6277)

Rewrites the internal/db/queries comments to rule 32 and regenerates
dbq, whose doc comments and embedded SQL carry them. The bugs behind the
tiered mixes, the md5 order seed, the score bands and the round-robin
arms are restated as the constraint each one enforces; counts from one
library and stale cross-references are gone.

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

internal/db/dbq/search.sql.go

@@ -99,7 +99,7 @@ const getAcquisitionSettings = `-- name: GetAcquisitionSettings :one
 SELECT id, auto_grab, search_interval_hours, allowed_qualities, last_pass_at, last_pass, updated_at, import_root, seed_ratio, seed_days, stall_hours, library_listing_started_at, library_listed_at, library_unlisted, upgrade_until FROM acquisition_settings WHERE id = true
 `
 
-// Searching for wants and grabbing releases (M502 #5521).
+// Searching for wants and grabbing releases.
 func (q *Queries) GetAcquisitionSettings(ctx context.Context) (AcquisitionSetting, error) {
 	row := q.db.QueryRow(ctx, getAcquisitionSettings)
 	var i AcquisitionSetting
@@ -385,7 +385,7 @@ SELECT info_hash, name, reason, detail, want_id, blocked_by, blocked_at, expires
 `
 
 // Every release set aside and still held back: a stalled one lifts by itself
-// at expires_at (#5523).
+// at expires_at.
 func (q *Queries) ListReleaseBlocks(ctx context.Context) ([]ReleaseBlock, error) {
 	rows, err := q.db.Query(ctx, listReleaseBlocks)
 	if err != nil {
@@ -500,7 +500,7 @@ type ListWantsDueForSearchRow struct {
 // Wants with no download running that were never searched or not since
 // @hours ago: open wants first (never-searched, then requests, then missing
 // files, then followed artists' releases), then held albums wanted for an
-// upgrade (#5524), which are searched at most weekly.
+// upgrade, which are searched at most weekly.
 func (q *Queries) ListWantsDueForSearch(ctx context.Context, arg ListWantsDueForSearchParams) ([]ListWantsDueForSearchRow, error) {
 	rows, err := q.db.Query(ctx, listWantsDueForSearch, arg.Hours, arg.MaxRows)
 	if err != nil {