feat(mesh): headscale control plane + three subnet routers provisioned; DNS entries; plan status

persistent-memory.md

@@ -473,6 +473,7 @@ below is a live commitment or a known-open risk._
 
 ## Recent decisions
 
+- `[2026-09-06]` **Headscale overlay mesh: control plane live at `headscale.phasefinal.com` (CT 106 nh3-pve) + subnet routers nh3-scale/esh-scale/ana-scale serving their /16s; nh3-dev enrolled. NOT cut over — Site Magic + IPsec still carry site-to-site.** ⚠ accept-routes-before-return-path black-holed nh3-dev's LAN for a minute. infra-ops user added on all four PVE hosts. → `persistent-memory.d/2026-09-06-headscale-mesh-phase1.md`
 - `[2026-09-06]` **pfi-pve NASPool REBUILT as six-wide raidz2 after a backplane fault killed bays 9/10** (Route C hybrid, operator-directed): parked 1.65T on ospool, destroyed, recreated, restored, backup tier back 04:03Z; guests never stopped (ALL boot disks are on ospool — the prior brief had this wrong). Legacy vzdump pruned to newest-per-guest by omission. OPEN: destroy `ospool/naspool-evac` after scrub + one backup cycle; backplane swap next visit; PSU1 still dead. → `persistent-memory.d/2026-09-06-pfi-pve-naspool-raidz2-rebuild.md`
 - `[2026-09-05]` **A peer's "2.7x serving-stack effect" was a coin flip — the operator rejected it on instinct and the arithmetic backed him.** Each floor was `|b0-b1|` from n=2; the ratio is half-Cauchy, P=0.452. ⚠ The disconfirming evidence sat in brokkr's own sentence, and he named *why*: the claim was his and flattering. → `persistent-memory.d/2026-09-05-floor-claim-n2-retraction.md`
 - `[2026-09-05]` **vLLM RUNS on sm_121 — the blocker was `ninja` off PATH, not the silicon** — and run 4 launched after two peer artifacts were rejected by reading the harness rather than accepting a "confirm this". ⚠ I declined to fill in missing `root_sha256` values I knew, because supplying both sides of a check makes it inert. → `persistent-memory.d/2026-09-05-vllm-on-sm121-and-run4.md`