chore(agentnetwork): address automated review feedback

Drain the peer update channels after the bootstrap in the realstack
test so its fan-out assertions can only be satisfied by the operation
under test; use assert with a length guard for diffMappings conditions
under test; drop the duplicate labelgen package comment and two stale
provider-bootstrap comments in the e2e suite; add context to the
exclusion test's account-ID assertion.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

e2e/agentnetwork/guardrail_block_test.go

@@ -113,7 +113,7 @@ func runPathRoutedGuardrailCase(t *testing.T, tc pathRoutedGuardrailCase) {
 
 	// Catch-all provider (no models) so the router forwards any model; a static
 	// bearer key means the router injects a static auth header instead of minting
-	// a GCP token. Bootstraps the cluster if it isn't already.
+	// a GCP token.
 	staticKey := "static-e2e-token"
 	prov, err := srv.CreateProvider(ctx, api.AgentNetworkProviderRequest{
 		Name:        tc.name,

e2e/agentnetwork/guardrail_multipolicy_test.go

@@ -61,7 +61,7 @@ func TestGuardrailMultiPolicyModelAllowlist(t *testing.T) {
 	}
 
 	// pRestricted declares the two guardrailed models so routing is deterministic
-	// (model -> provider). Created first, so it carries the bootstrap cluster.
+	// (model -> provider).
 	pRestricted, err := srv.CreateProvider(ctx, api.AgentNetworkProviderRequest{
 		Name:        "restricted",
 		ProviderId:  "openai_api",