Contract storage

[OluRemiFour]

Close: #863

Summary

I have successfully implemented and tested the authorization hardening for contributor metadata updates.

Changes completed:

Re-architected update_contributor enforcing explicit self-service authorization while maintaining state accurately.
Introduced update_contributor_admin routing through the Multisig ProposalAction::UpdateContributor pattern.
Integrated the ContributorUpdatedEvent emitting the actor modifying the state.
Wrote an extensive set of test cases verifying self-service vs admin-managed permissions natively into lib.rs.
All 43 unit tests now successfully pass. A walkthrough document has been created for your reference summarizing the changes.

Linked Issue

Closes #

Type of Change

• feat
• fix
• docs
• refactor
• test
• chore

Validation

• Lint passed for affected area(s)
• Tests passed for affected area(s)
• Manual verification completed (if applicable)

Documentation

• Documentation updated (or N/A with explanation)
• Screenshots/videos attached for UI changes

Checklist

• Branch name uses feat/, fix/, or docs/
• Commit messages follow Conventional Commits
• PR scope matches linked issue acceptance criteria

[OluRemiFour]

Done, Close: #931

[Cedarich]

@OluRemiFour fix workflow

[Cedarich]

@OluRemiFour Fix CI