Town: one report for several runs

A village and the pair runs (Hollo, Iceshrimp.NET, Pleroma) are checked
apart; town.sh report takes them together and adds their cells up, so one
matrix shows every server.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tools/pasture/town/town.py

@@ -8,7 +8,7 @@
   plan <spec>                   the deterministic plan of a spec, printed as JSON lines
   seed <spec>                   replays a spec's plan against the pasture, writing out/<run>/ledger.jsonl
   check [run]                   sweeps every peer for what the ledger expects
-  report [run]                  out/<run>/report.html
+  report [run...]               out/<run>/report.html; several runs (a village and pairs) in one matrix
   backlog [run] [--write]       docs/INTEROP-BACKLOG.md from the latest results
 """
 import json