feat(node): implement runtime process manager and java launcher (#108)

[midagedev]

Summary

• add Java launcher entrypoint TcpMongoServerLauncher for external runtime process usage
• extend TcpMongoServer with configurable host/port constructors
• add Gradle helper task printLauncherClasspath for Node runtime bootstrap
• implement Node startJongodbMemoryServer runtime manager with readiness wait, timeout handling, and graceful/forced stop
• add runtime integration tests (mongodb driver ping/CRUD, 20-cycle start/stop, missing java binary, port-in-use failure)

Validation

• npm run node:build
• npm run node:typecheck
• npm run node:test
• ./.tooling/gradle-8.10.2/bin/gradle --no-daemon test

Issue

Closes #108
Part of #106

[midagedev]

Review note: waitForStartup attaches line/error/exit listeners but does not detach them after startup settles. In repeated start/stop workloads this can accumulate listeners and retained log buffers. Please add listener cleanup in both resolve and reject paths.

[midagedev]

Follow-up patch applied:

• detached startup listeners (line/error/exit) after readiness/timeout/exit resolution in waitForStartup
• reran npm run node:test (all pass)