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.go

@@ -0,0 +1,79 @@
+package mcp
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const tokenFileName = ".tm_token"
+
+// TokenFile holds credentials from a workspace .tm_token file.
+type TokenFile struct {
+	Project string
+	Token   string
+	Path    string
+}
+
+// FindTokenFile walks from start (usually cwd) upward looking for .tm_token.
+func FindTokenFile(start string) (TokenFile, error) {
+	dir, err := filepath.Abs(start)
+	if err != nil {
+		return TokenFile{}, err
+	}
+	for {
+		path := filepath.Join(dir, tokenFileName)
+		if st, err := os.Stat(path); err == nil && !st.IsDir() {
+			tf, err := ParseTokenFile(path)
+			if err != nil {
+				return TokenFile{}, err
+			}
+			return tf, nil
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			break
+		}
+		dir = parent
+	}
+	return TokenFile{}, fmt.Errorf("no %s found (create an MCP token in the TUI with g, then place project=… and token=… in %s)", tokenFileName, tokenFileName)
+}
+
+// ParseTokenFile reads project= and token= lines from path.
+func ParseTokenFile(path string) (TokenFile, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return TokenFile{}, err
+	}
+	defer f.Close()
+
+	tf := TokenFile{Path: path}
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		line := strings.TrimSpace(sc.Text())
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		key, val, ok := strings.Cut(line, "=")
+		if !ok {
+			continue
+		}
+		key = strings.TrimSpace(strings.ToLower(key))
+		val = strings.TrimSpace(val)
+		switch key {
+		case "project":
+			tf.Project = val
+		case "token":
+			tf.Token = val
+		}
+	}
+	if err := sc.Err(); err != nil {
+		return TokenFile{}, err
+	}
+	if tf.Project == "" || tf.Token == "" {
+		return TokenFile{}, fmt.Errorf("%s must contain project= and token= lines", path)
+	}
+	return tf, nil
+}