Expand P2 test coverage: mining chain, spread lanes, path forge, WS/beacon, E2E onion, file handling

agent/miner/tier_vuln_probe.go

@@ -14,6 +14,11 @@ func SetVulnProbeRunner(fn func() TierAttempt) {
 	vulnProbeRunner = fn
 }
 
+// VulnProbeRunnerWired reports whether a custom probe runner is registered (tests inject before chain wiring).
+func VulnProbeRunnerWired() bool {
+	return vulnProbeRunner != nil
+}
+
 // RunVulnProbeTier runs authorized fleet vulnerability recon (report-only, no exploit).
 func RunVulnProbeTier(ctx context.Context, cfg config.RuntimeConfig) TierAttempt {
 	select {