mesh-build-node: announce the states it keeps from its code, so readers are granted from its word (issue 1790, ADR 0495 §2 §5)

Kept (toolchains, keys, steps, each read by another module today) is said with stdio.Keeps
before the module serves; announcetest.Check holds the announcement equal to the code. The
module is pinned to mesh-sdk feat/r4e-sdk 9cb4d59.

modules/mesh-build-node/go.mod

@@ -2,4 +2,21 @@ module meshbuildnode
 
 go 1.26.0
 
-require git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261021192148-78364e318bdc
+require (
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261022160024-9cb4d59093a7
+	github.com/nats-io/nats.go v1.54.0
+)
+
+require (
+	github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op // indirect
+	github.com/google/go-tpm v0.9.8 // indirect
+	github.com/klauspost/compress v1.20.0 // indirect
+	github.com/minio/highwayhash v1.0.4 // indirect
+	github.com/nats-io/jwt/v2 v2.8.1 // indirect
+	github.com/nats-io/nats-server/v2 v2.11.17 // indirect
+	github.com/nats-io/nkeys v0.4.16 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	golang.org/x/crypto v0.57.0 // indirect
+	golang.org/x/sys v0.48.0 // indirect
+	golang.org/x/time v0.15.0 // indirect
+)