[node][runtime] Implement start/stop process manager for jongodb

[midagedev]

Objective

Implement runtime process manager to launch/stop jongodb for Node tests and expose connection URI.

Deliverables

• start() API with options (port, host, dbPath?, logLevel)
• process health-check and ready detection
• stop() teardown with timeout handling
• deterministic temp-resource cleanup

Success Criteria

• start/stop works repeatedly in a single process (>=20 cycles test)
• returns usable mongodb:// URI for official Node driver
• failure paths produce actionable errors (spawn fail, port in use, timeout)

Parallel Notes

• Ownership: runtime launcher only
• avoid test-runner specific code (Jest/Vitest hooks are separate)

PR Checklist

• include review comments and follow-up commit before merge
• add unit tests for timeout/retry/cleanup paths

Depends On

• Epic [EPIC][node] Publish Node.js adapter package for jongodb #106
• Scaffold [node][scaffold] Create @jongodb/memory-server package skeleton #107

[midagedev]

Status: in progress. Implementing runtime start/stop process manager with readiness protocol ( line), timeout handling, and lifecycle tests (including repeat start/stop cycles).

[midagedev]

Implementation PR opened: #114\n\nIncluded:\n- Java launcher entrypoint ()\n- configurable host/port runtime in \n- Node start/stop process manager with readiness timeout/error handling\n- runtime tests including 20-cycle start/stop and driver ping/CRUD

[midagedev]

Clarification update for implementation status:

• Java launcher entrypoint added in src/main/java/org/jongodb/server/TcpMongoServerLauncher.java
• configurable host/port runtime wiring added in src/main/java/org/jongodb/server/TcpMongoServer.java
• Node process manager implemented in packages/memory-server/src/index.ts
• runtime tests added in packages/memory-server/src/test/runtime.test.ts