Fix MCP initialization of specmatic mcp server via node

[vedubhat]

• npx -y specmatic mcp server was failing during MCP initialization with a JSON parse error.
• The root cause was the Node wrapper capturing Java stdout/stderr and re-emitting them through its own output, which mixed logs into the MCP protocol stream.

Acceptance Criteria:

• Register specmatic mcp server via node to a coding agent
• Test the mcp server with coding-agents lab