Add a shared error-code catalog so failures can be traced by stable codes.

Services can resolve legacy aliases and expose the catalog over CLI and HTTP instead of ad-hoc error strings.

Co-authored-by: Cursor <cursoragent@cursor.com>

cli/cli_test.go

@@ -0,0 +1,50 @@
+package cli
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"error-code-system/domains"
+	"error-code-system/errcode"
+)
+
+func TestCLIListShowValidate(t *testing.T) {
+	reg := errcode.NewRegistry()
+	domains.RegisterAll(reg)
+	prev := errcode.Default
+	errcode.Default = reg
+	t.Cleanup(func() { errcode.Default = prev })
+
+	var out, errBuf bytes.Buffer
+	if code := Run([]string{"list", "--domain", "sys"}, &out, &errBuf); code != 0 {
+		t.Fatal(errBuf.String())
+	}
+	if !strings.Contains(out.String(), "sys.internal") || strings.Contains(out.String(), "agent.") {
+		t.Fatalf("list:\n%s", out.String())
+	}
+
+	out.Reset()
+	if code := Run([]string{"show", "TIMEOUT"}, &out, &errBuf); code != 0 {
+		t.Fatal(errBuf.String())
+	}
+	if !strings.Contains(out.String(), string(errcode.AgentTimeout)) {
+		t.Fatalf("show:\n%s", out.String())
+	}
+
+	out.Reset()
+	if code := Run([]string{"validate", "nope"}, &out, &errBuf); code != 1 {
+		t.Fatalf("validate exit %d %s", code, out.String())
+	}
+	if !strings.Contains(out.String(), "known=false") || !strings.Contains(out.String(), string(errcode.SysUnknownCode)) {
+		t.Fatalf("validate:\n%s", out.String())
+	}
+
+	out.Reset()
+	if code := Run([]string{"search", "角色"}, &out, &errBuf); code != 0 {
+		t.Fatal(errBuf.String())
+	}
+	if !strings.Contains(out.String(), string(errcode.SquadRoleNotFound)) {
+		t.Fatalf("search:\n%s", out.String())
+	}
+}