test(parity): port JetStream batch publish & versioning tests (Tasks 9-10, 113 tests)
T9: 46 tests covering atomic batch publish API — stage/commit/rollback,
cleanup, limits, dedup rejection, source/mirror, expected seq/subject
T10: 67 tests covering API level negotiation, stream/consumer metadata
(static/dynamic), direct get batch, snapshot/restore stall
Go refs: jetstream_test.go, jetstream_versioning_test.go
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