[jihtsan]

Standardize parses slices backed by the caller's input and overwrites comment bytes before packing the result. Callers that retain their original JSONC buffer can therefore lose its comments.

Document that the input may be modified and show Standardize(bytes.Clone(b)) for callers that need to preserve it. This follows the documentation option in #57 and the existing CLI's practice of copying its source buffer; runtime behavior and allocation costs stay the same.

Validation with Go 1.26.6 on macOS:

• Reproduced the input mutation using the issue's example; passing bytes.Clone preserved the original input and produced valid JSON.
• go test ./... ./cmd/hujsonfmt/... and go vet ./... ./cmd/hujsonfmt/... passed.
• go doc Standardize displays the guidance; gofmt -d format.go and git diff --check were clean.

Linux/Windows CI was not run locally. Prepared and reviewed with Codex assistance; commit includes DCO sign-off.

Fixes #57.