Ship as tm with install to GOPATH/bin and sandbox env overrides.

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

internal/config/config.go

@@ -3,17 +3,23 @@ package config
 import "path/filepath"
 
 const (
-	AppName         = "task-master"
-	DefaultProject  = "inbox"
-	DefaultTheme    = "default"
-	configFileName  = "config.json"
+	// AppName is used for config/data directory names under XDG paths.
+	AppName = "task-master"
+	// CliName is the installed binary / command name.
+	CliName        = "tm"
+	DefaultProject = "inbox"
+	DefaultTheme   = "default"
+	configFileName = "config.json"
+
+	envHome    = "TASK_MASTER_HOME"
+	envDataDir = "TASK_MASTER_DATA_DIR"
 )
 
 // Config holds application settings persisted under ~/.config/task-master.
 type Config struct {
-	ActiveProject string            `json:"activeProject"`
-	DataDir       string            `json:"dataDir"`
-	Theme         string            `json:"theme"`
+	ActiveProject string `json:"activeProject"`
+	DataDir       string `json:"dataDir"`
+	Theme         string `json:"theme"`
 	// ProjectLists maps project ID → comma-separated board list ids
 	// (e.g. "all" or "backlog,in_progress").
 	ProjectLists map[string]string `json:"projectLists,omitempty"`