HIP-25 HACD staking port (draft, actions 37/38)

[Moskyera]

Summary

Draft port of HIP-25 v3 HACD staking for fullnodedev.

Reference: https://github.com/Moskyera/rust/tree/hip-25-staking @ \�0.1.0-hip25-reference\

Action mapping

Kind | Action

37 | DiaStake
38 | DiaUnstake

(Legacy rust fork used 34/35; fullnodedev reserves those for HIP-22 inscription.)

Included (Phase 1-2)

• Staking types + CoreState keys 18-21
• Diamond status 4/5 (staked / cooldown)
• Stake / unstake actions
• Block-close reward distribution + unlock queue
• DiamondMint miner-share redirect to staking pool (v3 economics)
• Config: \staking_activation_height = 0\ in [mint]\ (disabled until fork height agreed)

Not included yet

• RPC /query/staking/*\
• Ported integration tests from reference impl
• Mainnet activation height

Note

Not activated on mainnet. For maintainer review coordinate with Istanbul (765432) timing.