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5a48365fb9
## Problem We've had bugs where the compute would use the stale default stripe size from an unsharded tenant after the tenant split with a new stripe size. ## Summary of changes Never specify a stripe size for unsharded tenants, to guard against misuse. Only specify it once tenants are sharded and the stripe size can't change. Also opportunistically changes `GetPageSplitter` to return `anyhow::Result`, since we'll be using this in other code paths as well (specifically during server-side shard splits).