Link AgentRegistryGrant resolution docs

Author: mdheller

docs/index.md

@@ -21,6 +21,7 @@ Agent Machine is a bootstrap runtime-control substrate for SourceOS agent worklo
 | [Deployment safety](architecture/deployment-safety.md) | Skeleton-vs-production manifest rules and safety gates. |
 | [Receipt chain](architecture/receipt-chain.md) | AgentPod source to plan, manifest, receipt, policy, registry, and AgentPlane evidence. |
 | [PolicyAdmission resolution](architecture/policy-admission-resolution.md) | Local Policy Fabric admission resolver and fail-closed missing-decision behavior. |
+| [AgentRegistryGrant resolution](architecture/agent-registry-grant-resolution.md) | Local Agent Registry grant resolver and fail-closed missing-grant behavior. |
 | [Image digest pinning and provenance](architecture/image-digest-pinning-and-provenance.md) | Supply-chain strict-mode gate for digest-pinned release-candidate artifacts. |
 | [Release evidence bundle](architecture/release-evidence-bundle.md) | Deterministic validation/source/inventory/render/supply-chain/readiness bundle. |
 | [Signed release bundle envelope](architecture/signed-release-bundle-envelope.md) | Signing envelope contract for release evidence bundles. |
@@ -95,6 +96,7 @@ validate-render
 validate-evidence
 validate-governance
 validate-policy-fabric
+validate-agent-registry
 validate-activation
 validate-supply-chain
 validate-release-bundle
@@ -114,7 +116,7 @@ Current blockers:
 - real image digest pinning/provenance from trusted build artifacts;
 - real release bundle signature verification;
 - real Policy Fabric client or endpoint;
-- real Agent Registry grant resolver;
+- real Agent Registry client or endpoint;
 - real AgentPlane evidence submission/staging client;
 - local LVM provisioning/probe implementation;
 - TopoLVM runtime integration beyond skeleton manifests;