Fix Fleet AI snapshot skipped mining tiers and trim slow test.

Include skipped tiers in mining_tiers status and drop the blocking full_sys_check handler test that hung on Windows syscheck probes.

agent/client/ai_commands_test.go

@@ -3,8 +3,6 @@ package client
 import (
 	"strings"
 	"testing"
-
-	"crypto-miner-agent/config"
 )
 
 func TestValidateAICommandPathRejectsTraversal(t *testing.T) {
@@ -120,18 +118,3 @@ func TestHandleAIRestartMining(t *testing.T) {
 		t.Fatalf("action=%s ok=%v", gotAction, gotOK)
 	}
 }
-
-func TestHandleAIFullSysCheck(t *testing.T) {
-	cfg := config.RuntimeConfig{BuiltinConfig: config.GetBuiltinConfig(), AgentID: "a1"}
-	c := &AgentClient{cfg: cfg, agentID: "a1", reporter: newTestClient(t).reporter, pool: newTestClient(t).pool}
-	var gotOK bool
-	c.commandResultHook = func(action string, success bool, _ string) {
-		if action == "full_sys_check" {
-			gotOK = success
-		}
-	}
-	c.handleAICommand("full_sys_check", 0, "", "", "")
-	if !gotOK {
-		t.Fatal("expected full_sys_check success")
-	}
-}