feat: add Solana node operator performance rewards

[raymondjacobson]

Summary

• add the Anchor performance rewards program with frozen epochs and stake-weighted Ethereum identity attestations
• add deterministic Merkle claims, replay protection, and atomic prior-epoch expiry accounting
• integrate builds, program key replacement, and operator documentation
• add exact Go/Rust leaf, pair, odd-tree, proof, commitment-message, and commitment-hash vectors
• add malformed-proof property sweeps and document the Core performance-snapshot artifact/relayer handoff

Testing

• cargo fmt --all -- --check
• cargo test --workspace --all-targets --locked: 16 unit tests and 1 lifecycle integration test passed
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo build --workspace --locked
• Solana 1.18.4 cargo-build-sbf completed and rebuilt target/deploy/performance_rewards.so
• SBF SHA-256: 28ac2a80af758214e875d915a92f9d721329b1bed0a40d30a1705729033285f0