fix(isthmus): Upgrade transactions + system calls

[clabby]

Overview

Fixes the upgrade transactions and system calls for Isthmus.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.7%. Comparing base (8d48a35) to head (70c7281).
Report is 4 commits behind head on rf/bump-monorepo.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/protocol/protocol/src/fee.rs	88.8%	1 Missing ⚠️

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[mattsse]

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[refcell]

Thanks for fixing these 🙏