concoredocker.java ZMQ sends Python literals, Python expects JSON, interop breaks on non-numeric data

[avinxshKD]

Python's ZMQ transport (concore_base.py) uses send_json()/recv_json() , JSON on the wire. Java's ZMQ (added in #483) serializes with toPythonLiteral() and parses with literalEval(), Python-literal format on the wire.

For pure numeric lists like [0.0, 1.5, 2.3] both formats look identical, so it works. The moment you have a boolean or null in the payload:

• Java sends [0.0, True, None] => Python's json.loads throws JSONDecodeError
• Python sends [0.0, true, null] => Java's literalEval hits parseKeyword("true") => IllegalArgumentException

Fix is Java-side only:

Add a toJsonLiteral() serializer (mirrors toPythonLiteral() but outputs true/false/null/double-quoted strings)
Use it in the ZMQ write() path
Extend parseKeyword() in Parser to also accept true/false/null so Java can receive from both formats

File I/O stays Python-literal (unchanged), only ZMQ path changes.

[avinxshKD]

working on this as discussed