fix(v0.4.1): route all workspace commands through SearchRoots

Every resolver, lister, and most-recent caller now passes
config.SearchRoots() so CTASK_PROJECT_ROOT is searched alongside
CTASK_ROOT. Commands use ws.Root when rendering relative paths or
session env vars so displays and CTASK_ROOT exports are correct for
workspaces living under CTASK_PROJECT_ROOT.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/open.go

@@ -31,8 +31,8 @@ func init() {
 }
 
 func runOpen(cmd *cobra.Command, args []string) error {
-	root := config.ResolveRoot()
-	ws := resolveOne(root, args[0], openAll)
+	roots := config.SearchRoots()
+	ws := resolveOne(roots, args[0], openAll)
 
 	// Update updated_at
 	now := time.Now().UTC().Truncate(time.Second)
@@ -42,7 +42,7 @@ func runOpen(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("updating metadata: %w", err)
 	}
 
-	envVars := config.EnvVars(ws.Meta.Slug, ws.Meta.Mode, root, ws.Path, ws.Meta.Category, workspace.EffectiveType(ws.Meta))
+	envVars := config.EnvVars(ws.Meta.Slug, ws.Meta.Mode, ws.Root, ws.Path, ws.Meta.Category, workspace.EffectiveType(ws.Meta))
 
 	return session.Run(session.LaunchOpts{
 		WsDir:   ws.Path,