Deregistration Ranking

Fetch the order in which the chain would deregister subnets to make room for a new registration (#10285) — 'how close is this subnet to being pruned', answered with the pallet's own rule rather than a proxy for it. Subtensor::get_network_to_prune() skips root, skips every subnet still inside NetworkRegisteredAt + NetworkImmunityPeriod, compares get_moving_alpha_price, and breaks a tie on the EARLIER registration. TWO THINGS MAKE THIS NOT A PRICE SORT. First, immunity: measured at block 8,808,300, sixteen of 128 subnets were inside their window, and a price-only order puts netuid 86 at position one — it reads a moving price of exactly 0 but cannot be deregistered at all, while the chain's answer is netuid 70. Second, get_moving_alpha_price substitutes a FLAT 1.0 for a Stable subnet (SubnetMechanism 0) instead of reading SubnetMovingPrice, which moves it from the top of a price order to near the bottom; every mainnet subnet reads mechanism 1 today, so the clause is invisible until one sudo call makes it decisive. ranked holds only prunable subnets, rank 1 first. immune holds the protected ones ordered by how soon protection lapses — the order in which they join the ranking — carrying immune_until_block and blocks_until_prunable; ordering them by price would imply a pruning position they do not have. Each entry publishes comparison_price (what the pallet compares) beside moving_price (the raw read), so the Stable substitution is visible. Served live (no static file); 503 when the capture carries no pinned block or no immunity period, because an ordering computed without the immunity window is not an approximation — it is a different ordering that looks the same and would be believed.

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