docs(journal): matrix run 1 complete; 06:00 pause notes

.pi/journal.md

@@ -543,3 +543,13 @@ pull MidnightLib 1.10.0, jar also dropped in `mods/`). Gamescope integration app
   dh-thr4 loses S5 (threads stay 2). Analyze with `--since 2026-10-16T22:24`.
 - Remaining after run 1: B4h (`--param gc=`), B7 shader rows, B12b, B13, B14, ship,
   owner report. Analysis proxy-only; noise floor gpu_dpm_auto (no root).
+- **2026-10-17 06:00 pause**: matrix run 1 finished first (**56/56 ok, 0 failures**,
+  B0–B12a incl. proxy B5). Timer `pause-bench-start-server.sh` started the server, but
+  tmux was born inside the oneshot service's cgroup and systemd killed it (and the
+  server, SIGKILL 1 s after `Done`, no players) when the unit exited. Restarted 06:05 in
+  its own scope (`systemd-run --user --scope tmux …`, unit `onion-mc-tmux.scope`);
+  script fixed the same way. **Server is up (25565).**
+- B4 GC verdict: J1 vs J0 S5 1%-low +1.3 fps < 6.6 spread → tie → **J0**.
+- Resume (stop the server first): `cd analysis/client-perf/harness &&
+  python3 matrix.py run B4h,B7,B12b --param gc=J0` (20 sessions, ~3.5 h). Then B13
+  (manual spark), B14 (manual spawn counts), ship, owner report.