Move the self-check out of the controller into mesh-self-check, so its runs and findings no longer need the controller's lease (issue 1952)

The probes whose facts are on the bus run with their assertions unchanged (D6, D7, D15, DW, H-bus); the rest answer deferred, naming what they lack, never a pass. Findings go to its own bucket for the condition keeper; each run is kept a week and said as checked. The finding layout is a copy of mesh-sdk's S3 until that lands.

modules/mesh-self-check/go.mod

@@ -0,0 +1,22 @@
+module mesh-self-check
+
+go 1.26.0
+
+require (
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261029200316-22c9ddd32b6a
+	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
+)