Avoid rescanning unsupported input names

internal/prompt/requirements.go

@@ -253,11 +253,9 @@ func (walker *requirementWalker) evaluateInputName(node parse.Node, reach requir
 		}
 		evaluation.unsupported = true
 	}
-	if evaluation.unsupported {
-		// Preserve directly recognizable references from a computed name without
-		// treating the computation itself as an evaluated dependency.
-		_ = walker.visit(node, requirementPossible, dot)
-	}
+	// Value analysis has already visited recognizable references, including
+	// the conservative fallback for unsupported expressions. Do not rescan
+	// the same subtree: nested computed names would multiply that work.
 	return walker.unresolvedInputName(evaluation)
 }