- Updated jest ecosystem to v30.x in backend/package.json
- Added controlled overrides for test-exclude to remove inflight@1.0.6 and glob@7.2.3
- Updated README.md with deprecation handling procedures and debugging steps
- Modified .kilo/plans/1779643125894-lucky-island.md to document systematic approach for dependency management
- Added `min-release-age=1` to backend/.npmrc to require packages to be at least 1 day old
- GitHub Actions backend jobs already use `npm ci` in backend/ directory, automatically enforcing the policy
- Updated README.md with supply-chain protection policy and operational procedures
BREAKING CHANGE: npm install/npm ci will now fail for packages younger than 1 day unless policy is temporarily overridden