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Bug: Marker value serialization always uses double quotes, breaking round-trips for values containing "

Bug: Marker value serialization always uses double quotes, breaking round-trips for values containing ": a task in repo2rlenv-swe-next (Harbor dataset). When serializing marker values, the serializer always wraps the value in double quotes. This causes incorrect behavior when the value itself…

The task

When serializing marker values, the serializer always wraps the value in double quotes. This causes incorrect behavior when the value itself contains a double quote character — the serialized form is no longer valid or semantically equivalent to the original.

Part of FineEnvs/repo2rlenv-swe-next.