♻️ Move OpenQASM serialization out of the operation hierarchy

[burgholzer]

🤖 AI text below 🤖

Goal

Preserve the public QuantumComputation OpenQASM export behavior while removing serialization responsibilities from every operation subclass.

Scope

• Introduce a dedicated serializer or visitor for classic IR.
• Remove dumpOpenQASM from the Operation virtual contract and subclasses.
• Move serializer-only register formatting aliases out of generic IR headers.
• Preserve deterministic output, layout comments, symbolic parameters, conditions, compound operations, and Python export behavior.
• Let QMAP own serialization for neutral-atom extensions after their extraction.

This issue concerns separation of responsibilities. It does not require classic circuits to be converted to MLIR before export.

Acceptance criteria

• Operation classes contain no OpenQASM formatting logic.
• Golden and round-trip tests demonstrate output compatibility.
• Debugger and QMAP consumers of direct operation dumping have an explicit replacement.