docs(runbook): link the gated declarative durable-shadow manifest (noetl/ops#239)
docs: record Alesha's APPROVED GO to prod durable-SHADOW (sign-off complete; shadow runbook refreshed; no prod action)
docs: prod-durability decision packet — D11 GAP->MET + #261 head-to-head re-run (deployed ~740ms->~6ms)
docs(durable-eventlog): slice 6 prod-durability sign-off package (ehdb#254) New Runbook-Durable-EventLog-Prod-Signoff page — go/no-go checklist (D1-D11), evidence bundle (slices 1-5), residual-risk register (R1-R7), and the extended durable-shadow -> durable-primary prod rollout sequence. Cross-linked from the tier-1 cutover runbook (§C update + Related), the design page, and _Sidebar; Sessions-Log + Home updated. Docs/planning only — no prod action; ehdb#254 slice-6 box stays unchecked.