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/archive.go

@@ -23,8 +23,8 @@ func init() {
 }
 
 func runArchive(cmd *cobra.Command, args []string) error {
-	root := config.ResolveRoot()
-	ws := resolveOne(root, args[0], false)
+	roots := config.SearchRoots()
+	ws := resolveOne(roots, args[0], false)
 
 	now := time.Now().UTC().Truncate(time.Second)
 	ws.Meta.Status = "archived"
@@ -36,7 +36,7 @@ func runArchive(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("updating metadata: %w", err)
 	}
 
-	relPath := workspace.RelativePath(root, ws.Path)
+	relPath := workspace.RelativePath(ws.Root, ws.Path)
 	fmt.Printf("[ctask] archived: %s\n", relPath)
 
 	return nil