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Add the new constant alongside existing `share.*` group-level entries . Register it in CONFIG_DEF with `Type.INT`, default sentinel (`-1` to indicate "unset"), validator `atLeast(-1)`, importance `MEDIUM`.

Validation that the group value does not exceed the broker ceiling is performed in `validate(Map<String, String> props, ShareGroupConfig defaults)` — the same hook used by other share group configs. If the requested value exceeds the broker ceiling, throw `InvalidConfigurationException` with a message naming both bounds.

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4. Wire the provider into ShareCoordinatorShard construction

Inject through the available builder (the provider is already available in the GroupCoordinatorService)

5. Documentation

- Update the [Kafka Configuration](https://kafka.apache.org/documentation/#configuration) page to reflect the new broker ceiling and to add the new group-level entry under "Share Group Configurations."
- Update the share-group operator documentation (`docs/streams/...` equivalent for share groups, exact location to be confirmed during implementation) with a tuning section explaining the snapshot/update tradeoff.

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