Add archreview/2026-10-21 (overall summary + tracker with R21-* rows).
Re-triage the 68 cycle-1 Not-started rows in place: 21 Done, 13 Won't fix,
34 Open (promoted as R21-O1..O34). Correct the 2026-08-19 tracker header
so CLI-47..50, IPC-36/37, TST-35 read Done like their rows.