- Bump cose2 to 0.5.1 and update the lockfile (cbor2 1.1.6 and transitive
  dependency patch releases).
- Align Markdown tables in AGENTS.md and README.md and wrap the aes-gcm
  workspace dependency in Cargo.toml.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>