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/queries/imports.sql

@@ -1,4 +1,4 @@
--- Import with verification (M502 #5522).
+-- Import with verification.
 
 -- name: ListLiveGrabs :many
 -- Every download still running or waiting on its import, oldest first.
@@ -52,7 +52,7 @@ UPDATE grabs
        import_forced = false,
        imported_at = CASE WHEN sqlc.arg(import_state)::text = 'imported' THEN now() ELSE imported_at END,
        -- The files were copied, so an imported download goes on sharing
-       -- until the lifecycle removes it (#5523).
+       -- until the lifecycle removes it.
        seeding = sqlc.arg(import_state)::text = 'imported',
        imported_files = sqlc.arg(imported_files),
        destination = sqlc.arg(destination),
@@ -114,7 +114,7 @@ SELECT DISTINCT COALESCE(t.disc_number, 1)::int AS disc, t.track_number::int AS
 -- name: ListGrabs :many
 -- The Wanted view's Activity tab: downloads waiting on a person first, then
 -- the rest still running, then the ended ones newest first. Each carries
--- what is wrong with it now, if anything (#5523).
+-- what is wrong with it now, if anything.
 SELECT g.id, g.want_id, g.name, g.indexer, g.client, g.quality, g.origin, g.forced,
        g.grabbed_at, g.ended_at, g.end_reason, g.end_detail, g.progress, g.import_state,
        g.import_reason, g.import_detail, g.import_updated_at, g.imported_at, g.imported_files,
@@ -142,7 +142,7 @@ SELECT b.info_hash, b.name, b.reason, b.detail, b.blocked_at, b.expires_at, w.ti
  LIMIT sqlc.arg(max_rows) OFFSET sqlc.arg(skip);
 
 -- name: ListUpgradeTracks :many
--- The tracks an upgrade may replace (#5524): the present tracks of the album
+-- The tracks an upgrade may replace: the present tracks of the album
 -- the want holds.
 SELECT id, file_path, mbid, COALESCE(disc_number, 1)::int AS disc, track_number,
        file_format, file_size, duration_ms, source_verdict
@@ -167,7 +167,7 @@ UPDATE tracks SET source_verdict = NULL, source_verdict_at = NULL
 -- name: ListImportedGrabsHolding :many
 -- The downloads Minstrel imported into the folder holding path: the releases a
 -- file there came from, to block when the files proved not to be the album
--- (#6169). A file imported before Minstrel downloaded anything has none.
+--. A file imported before Minstrel downloaded anything has none.
 SELECT id, info_hash, name, want_id
   FROM grabs
  WHERE import_state = 'imported'