Add Android APK fleet nodes with Crucible UI integration and tests.

APK wrapper registers platform=android via AETHERFORGE_PLATFORM; fleet UI shows robot icons, Android Access Depth probes, and a shortened mining onion timeline.

agent/miner/lotl_tier_test.go

@@ -235,3 +235,19 @@ func TestTierOrchestratorStubTiersFallThrough(t *testing.T) {
 		t.Fatalf("stub tier should fail: %v", *exeAttempt)
 	}
 }
+
+func TestSelectMiningTierChainAndroid(t *testing.T) {
+	t.Setenv("AETHERFORGE_PLATFORM", "android")
+	probes := EnvironmentProbes{
+		Wifi:              true,
+		Battery:           true,
+		ForegroundService: true,
+	}
+	chain, skipped := SelectMiningTierChain(probes, DefaultMiningTierPolicy(), testCfg(config.BuiltinConfig{}))
+	if len(chain) != 2 || chain[0] != TierForegroundService || chain[1] != TierCPUInprocess {
+		t.Fatalf("android chain=%v want [foreground_service cpu_inprocess]", chain)
+	}
+	if len(skipped) < 10 {
+		t.Fatalf("expected desktop tiers skipped, got %v", skipped)
+	}
+}