[node][scaffold] Create @jongodb/memory-server package skeleton

[midagedev]

Objective

Create Node package skeleton for @jongodb/memory-server inside this repository.

Deliverables

• workspace/package layout (packages/memory-server)
• TypeScript build setup (tsconfig, build scripts)
• lint/test scripts and basic unit test harness
• local developer commands documented

Success Criteria

• npm run build for package succeeds in CI
• package exports typed public API surface (stub allowed)
• no changes to existing Java artifact coordinates

Parallel Notes

• Ownership: package scaffolding/config only
• Do not implement process start logic here
• Keep runtime API implementation for dedicated issue

PR Checklist

• include review comments and follow-up commit before merge
• attach CI logs for build/test scripts

Depends On

• Epic [EPIC][node] Publish Node.js adapter package for jongodb #106

[midagedev]

Status: in progress. Starting package scaffold implementation now. Target: minimal workspace + typed API stub + package-local build/test.

[midagedev]

Implementation started in PR #112. Scope: workspace scaffold, typed API stub, package-local build/typecheck/test harness.