feat: set default identity on delegation

[GabrielePicco]

[Description](feat: set default identity on delegation)

Status	Type	⚠️ Core Change	Issue
Ready	Feature	No	-

Greptile Summary

Updated On: 2025-09-04 15:42:38 UTC

This PR introduces a default validator identity mechanism for the delegation system. The change adds a new constant DEFAULT_VALIDATOR_IDENTITY in src/consts.rs that specifies a hardcoded validator pubkey (MAS1Dt9qreoRMQ14YQuhg8UTZMMzDdKhmkZMECCzk57) to serve as a fallback when no validator is explicitly provided during delegation operations.

The implementation modifies the delegation processor in src/processor/delegate.rs to use this default validator identity via args.validator.unwrap_or(DEFAULT_VALIDATOR_IDENTITY) instead of potentially allowing undefined behavior when args.validator is None. This ensures every delegation record has a valid authority field, which is essential for the delegation system's operation.

The change integrates well with the existing codebase architecture by following the established pattern of defining program constants in consts.rs alongside other important values like RENT_FEES_PERCENTAGE and PROTOCOL_FEES_PERCENTAGE. The use of the pubkey! macro creates a compile-time constant from the base58-encoded address, maintaining type safety and efficiency consistent with Solana program development best practices.

Confidence score: 4/5

• This PR is safe to merge with low risk as it provides a sensible fallback mechanism
• Score reflects simple, well-structured changes that follow established patterns in the codebase
• Pay close attention to verifying the hardcoded validator pubkey is intentional and correct

[greptile-apps]

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