docs: restore runbook (#628) + sparse STATUS.md [#628 #344]

Baseline backup 34a05d70 pulled off-box. Runbook covers 3 layers:
HA-level, PBS VM-level (dev-lane drill rule), fresh-HAOS-from-git.

Meat: https://projects.knownelement.com/issues/790#note-4970

STATUS.md

@@ -0,0 +1,16 @@
+# STATUS — point-in-time agent state (sparse; history lives in Redmine)
+
+Updated: 2026-09-06 ~06:00 CDT · dev @ c4ebb8a · release @ 83b32d5
+
+| ticket | tier | state | item |
+|---|---|---|---|
+| #344 | prod | 🔄 | alert hygiene batch (7e13612) + #790 chain (c4ebb8a) on dev; release PR pending founder |
+| #790 | dev | ✅ | UPS shutdown chain landed, DRY RUN mode; exec wiring needs PVE tokens (NeedsInput) |
+| #628 | docs | ✅ | restore runbook + 788MB baseline backup (slug 34a05d70, off-box on ultix) |
+| #781 | infra | ⏳ | beta HA VM attempt in progress (HAOS on pfv-tsys5) |
+| #345 | prod | 🔄 | rest_command verified registered again; swap-back = founder re-test call |
+
+## Inbox
+- 2026-09-06: tsys6 ambient flap false-positive fixed via 5-min MA smoothing — watch trend sensors for 24h post-deploy
+- 2026-09-06: stlpc-artroom host down (raw+semantic sensors dead) — policy question in NeedsInput
+- gitea→HA deploy webhook still blocked (SSRF allowlist); sha-watch path is the pipeline