feat: port Lotus PR #13547 - integrate EC finality calculator into API and Eth RPC (FRC-0089)

[hanabi1224]

Overview

Port the deep integration of the FRC-0089 EC finality calculator into Forest's API and Eth RPC, as implemented in filecoin-project/lotus#13547.

Background

Lotus PR #13547 (feat(api): integrate EC finality calculator into v2 API and Eth RPC) builds on the shed tool from #12093 and integrates the EC finality calculator more deeply:

• Moves the calculator into the core node and adds a caching module (recalculates once per head change at most).
• Adds the probabilistic EC finality calculator alongside F3 for determining finalized/safe tipsets — effectively finalized = min(f3, ec-calculator), replacing the static 900-epoch fallback.
• Introduces the ChainGetTipSetFinalityStatus v2 API endpoint.
• Wires the calculator into both v2 and Eth tag resolution.

References

• Lotus PR: feat(api): integrate EC finality calculator into v2 API and Eth RPC filecoin-project/lotus#13547
• Depends on porting: feat(shed): ec finality calculator (FRC-0089) filecoin-project/lotus#12093
• FRC-0089 spec: https://github.com/filecoin-project/FIPs/blob/master/FRCs/frc-0089.md

Related

• Raised during review of chore(deps): bump go deps #6757