Cleanup: README.md contains leftover scratch text "no-op documentation tweak"

## Summary The published `README.md` opens with a stray paragraph that looks like leftover scratch text from a workflow-verification PR, sitting awkwardly between the "Node.js Support Policy" section and the actual project header: ``` # @airframes/acars-decoder This is a no-op documentation tweak to verify repository access, build/lint, tests, and PR workflow. No functional code changes are included. # acars-decoder-typescript ``` This is the README that ships on the package's npm and GitHub pages, so it's reader-facing. The two competing top-level headers (`# @airframes/acars-decoder` and `# acars-decoder-typescript`) also make the document structure confusing. ## Suggested fix - Delete the "no-op documentation tweak" sentence and the duplicate `# @airframes/acars-decoder` heading. - Optionally move the "Node.js Support Policy" section below the project header / badges so the README opens with the project name.