feat(raiko): enhance Shasta base fee/anchor offset calculation according to mono

[smtmfft]

• Updated calc_next_shasta_base_fee to include a minimum base fee parameter, ensuring base fees are clamped according to chain-specific requirements.
• Introduced min_base_fee_for_shasta_chain to determine the minimum base fee based on the chain ID.
• Adjusted related functions and validation logic to accommodate the new minimum fee parameter, improving the robustness of base fee validation for Shasta blocks.

[Copilot]

Pull request overview

This PR updates Shasta base fee calculation/validation to support a chain-specific minimum base fee (notably a higher minimum on Taiko mainnet), and threads that minimum through the existing calculation and validation flow.

Changes:

• Added a chain-aware minimum base fee selector (min_base_fee_for_shasta_chain) and a separate mainnet minimum constant.
• Updated calc_next_shasta_base_fee and validate_shasta_block_base_fee to clamp/validate against a provided minimum base fee.
• Wired generate_transactions_for_shasta_blocks to compute the chain-specific minimum from chain_spec.chain_id() and pass it into validation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
lib/src/utils/shasta_rules.rs	Adds chain-specific minimum base fee logic and updates base fee calculation/validation to use it.
lib/src/utils/shasta.rs	Computes the minimum base fee from chain ID and passes it into Shasta base fee validation.

Comments suppressed due to low confidence (1)

lib/src/utils/shasta_rules.rs:479

• This change removes the previously public clamp_shasta_base_fee API in favor of a private clamp_shasta_base_fee_with_min. If this crate has any downstream consumers, that’s a breaking change; consider keeping a public wrapper (possibly deprecated) or exposing a new public clamping function that takes min_base_fee/chain_id.

/// Clamp the provided base fee to the given minimum and max allowed for Shasta blocks.
fn clamp_shasta_base_fee_with_min(base_fee: u64, min_base_fee: u64) -> u64 {
    if base_fee < min_base_fee {
        min_base_fee
    } else if base_fee > MAX_BASE_FEE_SHASTA {
        MAX_BASE_FEE_SHASTA
    } else {
        base_fee
    }

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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