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When the broker receives a v6 request, it resolves topic IDs to topic names and returns `UNKNOWN_TOPIC_ID` for unresolvable IDs. The resolved names are used for authorization, partition validation, and offset storage. The topic ID is persisted in the `OffsetCommitValue` record, replacing the hardcoded `Uuid.ZERO_UUID`. For v6+ requests, the broker returns `GROUP_ID_NOT_FOUND` and `STALE_MEMBER_EPOCH` directly instead of mapping them to `ILLEGAL_GENERATION` when the consumer rebalance protocol is used. Existing behavior for v0-5 is preserved.
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