Owner Alpha Stake Changes

[JohnReedV]

Summary

This PR updates subnet registration so the new subnet pool and the owner’s starting stake are initialized from the same registration lock, using the current median subnet alpha price as the pricing snapshot.

Previously, subnet registration only:

• locked the registration TAO,
• seeded the new subnet pool with network_min_lock at a 1:1 TAO/alpha initialization,
• recycled the remainder,
• and set the subnet owner metadata.

With this change, registration now:

• computes the median subnet alpha price from existing eligible subnets,
• converts the full current registration lock cost from TAO into alpha at that snapshot price, calling this amount A,
• injects 25% of the current lock cost as TAO into the new subnet pool,
• injects A / 4 alpha into the pool as free alpha liquidity,
• grants the remaining A / 4 alpha to the subnet owner as staked alpha,
• records the owner grant in SubnetAlphaOut,
• and recycles the remaining 75% of the locked TAO that is not used to seed the pool.

This means the owner’s starting alpha comes out of the seeded A / 2 total alpha, rather than being minted on top of it.

In one line:
Registering a subnet now prices the registration lock at the current median subnet alpha price, seeds the pool with 25% of the lock as TAO and A / 4 alpha, grants the owner A / 4 alpha as initial stake, and recycles the remaining locked TAO.

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