Release Chain Insights v0.3.9

[aph5nt]

Summary

• add cia update / chain-insights update backed by the public npmjs registry
• bump Chain Insights release metadata to 0.3.9
• include unreleased 0.3.8 main changes in the published release path

Verification

• npm run release:check
• npm ci --ignore-scripts --audit=false --fund=false
• npm run typecheck
• npm run build
• npm test
• npm pack --silent | tar -tf
• node bin/cli.js update --check