Changelog

• d51eb97 chore(deps): bump cocoon-common to v0.2.1
• 627a431 chore: align tooling and add package docs
• 29297d0 chore: code review fixes for DHCP races, atomic state, and platform robustness (#3)
• 7bca288 fix(dhcp): enforce per-IP uniqueness in leases.add
• b66937e fix(gke): fetch project ID, not project number, from metadata