Run Prettier over README and roadmap docs to satisfy format:check, and add
.prettierignore plus .gitignore entries for playwright-report/test-results so
generated e2e artifacts no longer break the format gate.
Generated with [Devin](https://cli.devin.ai/docs)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
