Move self-described historical/upstream docs to docs/archive/: - agent-runbook-guide.md - lan-core-switch-upgrade-plan.md - lan-rb5009-upgrade.md - se5420-review-claim-verification-2026-08.md Update archive/README.md manifest and fix relative links in active docs and archived docs. Update AGENTS.md docs/ layout description.
- Reorder §3.3: create VLAN66/55 before SVI; keep VLAN1 until management path verified - Fix §3.4 verification port wording (enabled VLAN66 access port, e.g. port 6) - Harden VLAN10 phase: PVE boundary, gfw NAT/IPv6 policy, rollback order, verification chain