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/doctor.go

@@ -152,7 +152,7 @@ func runDoctor(cmd *cobra.Command, args []string) error {
 	}
 
 	// Check 5: Workspace root has workspaces
-	results, err := workspace.ListWorkspaces(root, workspace.ListOpts{
+	results, err := workspace.ListWorkspaces(config.SearchRoots(), workspace.ListOpts{
 		IncludeArchived: true,
 		Limit:           0, // no limit
 	})