docs: propose EvoNode Platform reward withdrawals

[shumkov]

Core v24 allows EvoNodes to register multiple owner payout scripts, but Platform's single-recipient withdrawal model cannot safely represent those recipients or arbitrary Core P2SH destinations. This draft DIP proposes owner-authorized withdrawals to the exact registered scripts, with a signed payout-policy commitment and one Asset Unlock transaction whose outputs and fee are fixed at acceptance.

Rewards continue accumulating on the existing identity. The current policy applies to all unwithdrawn funds, including earlier rewards and incoming credits; this does not create independent beneficiary claims. Unlike automatic Core coinbase payouts, the owner must initiate Platform withdrawals. The draft also specifies rounding, fees, policy changes, queue compatibility, activation ordering, and the recovery boundary for EvoNodes removed before activation.

The proposal complements the Core payout specification in #184. It uses an alias filename and leaves DIP numbering to the editors. Protocol/wire assignments, storage/query encodings, fee floors, and network migration evidence remain open before activation. No Platform implementation is included.

Validation: three independent design reviews covering scope, authorization, and migration/accounting; all identified pre-review corrections incorporated. Both changed Markdown files pass the repository's markdownlint configuration, and the numeric split examples were checked. Runtime tests do not apply to this documentation-only change; the DIP's test cases are implementation requirements, not executed results.

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