Changes
- Add a CI workflow: build, test and commit trailers (73fe498)
- Add notices, AI.md and CONTRIBUTING.md; drop pack.sh (a872371)
- Use the porthole-dev organisation for the app ID and links (0b8d8b5)
- An NFC application for the portal (3e3aaeb)
The source archive's provenance, where attested, is verified with
gh attestation verify <archive> -R porthole-dev/tap.