Repository guidance and public contribution templates for the product-ready v1 release.\n\n- Adds structured bug and feature request forms.\n- Adds a pull request template and support guidance.\n- Refreshes the public README, contribution guidance and release status.\n- Keeps runtime behaviour unchanged from v1.0.0.\n\nValidation: 61 tests, type and lint checks, production build, Cloudflare dry-run, high-severity dependency audit, main CI and live asset verification all passed.