Rebuild runbook + state capture + docs sync to current reality (#615)

REBUILD.md maps a full rebuild (PVE qm spec incl. nested-virt flag,
guest OS/accounts/dotfiles bootstrap, script order, package baseline,
verification checklist). 14-capture-state.sh regenerates docs/state
snapshots (guest apt/units/sysctl/fstab/docker + PVE 5111 config).
Docs sync: stale multiqueue-owed text removed from NEXT/REPORT/RUNBOOK;
README script list + open-work list current.

Details: https://projects.knownelement.com/issues/615

RUNBOOK-TODAY.md

@@ -4,15 +4,14 @@ Steps 1-3 below all landed and were verified read-only the same day (see
 REPORT.md status banner + §8, and NEXT.md). Kept for the record. Paths
 updated: repo moved ~/optimize → ~/projects/ultix.
 
-**Remaining perf actions (as of 2026-08-31 evening):**
-1. Net multiqueue activation — ONE graceful bounce of VM 5111:
-   `~/projects/ultix/5-activate-multiqueue.sh` (~4 min, kills every crush
-   session on this VM). Human ruling 08-31 eve: system idle tonight — good
-   window after the session's remaining tasks. Verify after:
-   `ethtool -l ens18` → Combined 4/4, `ethtool -l ens19` → 2/2.
+**Remaining perf actions (as of 2026-09-01):**
+1. Net multiqueue — DONE + verified 2026-09-01 morning (bounce
+   22:51->22:53; `ethtool -l` ens18 4/4, ens19 2/2).
 2. Root growth 279G → ~505G — fully manual, step-by-step with checks:
    `~/projects/ultix/GROW-ROOT-RUNBOOK.md` (#603). No script runs it; you
    type every command yourself.
+3. Rebuild-from-scratch path documented: REBUILD.md + docs/state
+   snapshots (regen: 14-capture-state.sh) — #615.
 
 **Friday 2026-09-04 (#609) is TROUBLESHOOTING-ONLY**: USB SDR reseat +
 zero-cost socket/PSU/BIOS checks. NO CPU/RAM swap, NO upgrades. All hardware