v0.3.9

Chain Insights v0.3.9

• Adds cia update / chain-insights update backed by the public npmjs registry.
• Prompts interactive cia init users when a newer npm release is available.
• Publishes the current main package, including the unreleased 0.3.8 staging test-key header support and stateless ACP proxy mode.

Verification before release:

• 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
• PR #63 checks passed.