docs: add interhub bootstrap access lane

SCOPE.md

@@ -57,6 +57,8 @@ backend is in use.
 - `ops-bridge` needs a `cert_command` to be defined for a tunnel
 - Adding a new actor to the principals inventory
 - Bootstrapping the CA for a new environment
+- Reaching a trusted execution host for attended Inter-Hub bootstrap work with
+  a short-lived agent certificate
 
 ---
 
@@ -123,6 +125,7 @@ keywords: [ssh, certificate, ca, credential, warden, ops-warden, pki, vault]
 - Start with: `SCOPE.md` (this file), then `wiki/AccessManagementDirective.md`
 - Config reference: `wiki/OpsWardenConfig.md`
 - cert_command contract: `wiki/CertCommandInterface.md`
+- Inter-Hub bootstrap access lane: `wiki/InterHubBootstrapAccessLane.md`
 - Config files: `~/.config/warden/warden.yaml`, `~/.config/warden/inventory.yaml`
 - State: `~/.local/state/warden/` (certs, generated keypairs)
 - Entry point: `warden --help`