Retroactive Grant Application - Maya Protocol: Zcash upstream contributions, NU6.2/NU6.3 Ironwood, Zebra migration and ZEC signing hardening

b Terms and Conditions I agree to the Grant Agreement terms if funded I agree to Provide KYC information if funded above $50,000 USD I agree to disclose conflicts of interest I understand that this grant program is only eligible for completed work, as it is a retroactive grant program. Applications for planned or partially completed work will not be considered. All completed work will be verified and accepted by its intended users or their representatives, who will confirm that the outputs meet the required quality, functionality, and usability before the work is listed as an option for Coinholder voting. I agree that for any new open-source software, I will create a CONTRIBUTING.md file that reflects the high standards of Zcash development, using the librustzcash style guides as a primary reference. I understand when contributing to existing Zcash code, I am required to adhere to the project specific contribution guidelines, paying close attenti