docs: MAX_PARALLEL=5 ran fine on the 9800X3D (TODO R2 done, comments)

AGENTS.md

@@ -32,7 +32,7 @@ wsl-build-host, progress-report, steamify-iso-release, steamify-branch-cleanup).
   suites cli, menu, hw, installer, toggles (`vmsuite.sh`, checks in `share/vmtest/`). Each passed in its own run: limine 43,
   systemd-boot 42, grub 42 (with the B1 boot entry check), cli 55, menu 36, hw 77, installer 4, toggles 42 checks.
 - 2026-09-29, on the PC (WSL2): the first complete parallel run, **328 pass, 0 fail in 18 minutes** (base image +
-  qcow2 overlays, own ssh port per job, package cache, `VM_MEM=4G`, `MAX_PARALLEL=3`). On a new machine: one full
+  qcow2 overlays, own ssh port per job, package cache, `VM_MEM=4G`, `MAX_PARALLEL=3`; 5 worked on the 9800X3D). On a new machine: one full
   `scripts/vmtest.sh --screen`, read `~/vms/last-test.txt`, fix what fails.
 - Open work: `TODO.md` (the CEC driver download, the GitHub Actions workflow, P3).