Nonce as uint256

[derekpierre]

NOTE: Before merging: update version of nucypher-core used - a new dev release will be needed

Type of PR:

• Bugfix
• Feature
• Documentation
• Other

Required reviews:

• 1
• 2
• 3

What this does:

Depends on nucypher/nucypher-core#126

Issues fixed/closed:

• Fixes #...

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network. E.g.,
if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

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[Copilot]

Pull Request Overview

This PR updates the nonce handling in UserOperation and PackedUserOperation to support uint256 values by converting them to strings internally. It also changes the @nucypher/nucypher-core dependency from an npm package version to a local linked directory for development purposes.

• Introduces getUint256String helper function to convert nonce values from bigint/number to string
• Updates test assertions to compare nonce values as strings
• Refactors tests to use helper functions (toCoreUserOperation, toCorePackedUserOperation) instead of direct constructors

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Updates dependency resolution to use local link for @nucypher/nucypher-core
packages/test-utils/package.json	Changes dependency to local path ../../../nucypher-core/nucypher-core-wasm-bundler
packages/taco/package.json	Changes dependency to local path ../../../nucypher-core/nucypher-core-wasm-bundler
packages/shared/package.json	Changes dependency to local path ../../../nucypher-core/nucypher-core-wasm-bundler
packages/pre/package.json	Changes dependency to local path ../../../nucypher-core/nucypher-core-wasm-bundler
package.json	Changes dependency to link:../nucypher-core/nucypher-core-wasm-bundler
packages/shared/src/types.ts	Adds getUint256String function and updates nonce handling to use string representation
packages/shared/test/porter.test.ts	Removes unused imports and refactors to use helper functions for creating UserOperation objects
packages/taco/test/taco-sign.test.ts	Updates nonce comparison logic to compare string representations

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (signing-epic@2d11ff3). Learn more about missing BASE report.

Additional details and impacted files

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##             signing-epic     #739   +/-   ##
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  Files                   ?       97           
  Lines                   ?     8453           
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  Hits                    ?     7619           
  Misses                  ?      831           
  Partials                ?        3           

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