chore(contracts): upgrade Solhint to 6

[alainncls]

Summary

• upgrade the Solidity catalog solhint entry from 5.2.0 to 6.2.1
• remove the solhint>ajv override that was only needed for solhint 5.x
• disable use-natspec in the shared Solhint config so the Solhint 6 upgrade does not flood CI with documentation-completeness warnings from existing contracts/tests
• refresh the pnpm lockfile

Validation

• pnpm install
• pnpm --filter @verax-attestation-registry/verax-contracts --filter @verax-attestation-registry/verax-examples -r run lint
• pnpm --filter @verax-attestation-registry/verax-contracts --filter @verax-attestation-registry/verax-examples -r run build
• pre-commit hook ran prettier, full lint, and contracts forge test successfully
• GitHub Actions Lint run 24895284932, job 72898272223 completed successfully and was not skipped
• GitHub Actions PR checks are green; size-contracts initially hit an external Hardhat compiler download timeout and passed on rerun

Warning surface

Solhint 6 substantially increased the warning output because solhint:recommended now surfaces use-natspec documentation checks across contracts, tests, mocks, and examples.

Before tuning, the PR had 1131 Solhint warnings total:

• contracts: 902 warnings, including 818 from use-natspec
• examples: 229 warnings, including 208 from use-natspec

After disabling only use-natspec, local Solhint output is back to a readable level while preserving the code-oriented warnings:

• contracts: 84 warnings, 0 errors
• examples: 21 warnings, 0 errors

The warnings shown in the linked build-contracts job are Foundry/Solidity compiler lint notes, not Solhint output. They are identical to the latest successful dev Contracts run and are not introduced by this Solhint PR.

Closes #1050

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​solhint@​5.2.0 ⏵ 6.2.1				+3	+31

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.41%. Comparing base (958483c) to head (681edd2).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1064   +/-   ##
=======================================
  Coverage   51.41%   51.41%           
=======================================
  Files          26       26           
  Lines         776      776           
  Branches      111      111           
=======================================
  Hits          399      399           
  Misses        377      377           

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