Subnet Ownership History

Fetch every ownership transfer one subnet has undergone (#6637, part of the conviction/ownership-contest tracker epic #4302) — see docs/conviction-lock-mechanism.md for the on-chain mechanism: a permissionless, conviction-weighted contest that runs continuously for every subnet, where ownership transfers automatically once a challenger's rolled conviction overtakes the incumbent owner's (no vote, no owner cooperation required). Two sources, labelled per record by source: chain-event records are decoded from the chain_events SubnetOwnerChanged stream and carry the block that emitted them, while owner-observation records are inferred from two consecutive owner captures, so their observed_at is when the change was NOTICED and block_number is null. Both are needed because a subnet's owning account can change without that event ever being emitted. observed_through reports how far the observation source covers this subnet at all. Served live from the all-events tier (ADR 0013), falling to the R2 lakehouse reader when that tier cannot answer, no static file. A subnet that has never changed hands returns an empty ownership_changes array, not an error — that's the common case.

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