Add stdio MCP server for token-scoped ticket access.

Expose tm mcp tools against the local daemon, document agent setup, and
ignore workspace .tm_token files.

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

internal/mcp/token_test.go

@@ -0,0 +1,43 @@
+package mcp
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestParseAndFindTokenFile(t *testing.T) {
+	root := t.TempDir()
+	sub := filepath.Join(root, "a", "b")
+	if err := os.MkdirAll(sub, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(root, ".tm_token")
+	content := "# comment\nproject=inbox\ntoken=tm_mcp_abc\n"
+	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	tf, err := FindTokenFile(sub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if tf.Project != "inbox" || tf.Token != "tm_mcp_abc" {
+		t.Fatalf("got %+v", tf)
+	}
+
+	_, err = FindTokenFile(t.TempDir())
+	if err == nil {
+		t.Fatal("expected missing token error")
+	}
+}
+
+func TestParseTokenFileIncomplete(t *testing.T) {
+	path := filepath.Join(t.TempDir(), ".tm_token")
+	if err := os.WriteFile(path, []byte("project=only\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := ParseTokenFile(path); err == nil {
+		t.Fatal("expected error")
+	}
+}