docs: add invoke.sh examples for proposal workflow

[Divine-mercyx]

Summary

• Add scripts/invoke.sh helpers for the multi-sig proposal workflow (create_proposal, approve_proposal, execute_proposal, plus get_proposal and related admin setup commands).
• Document a step-by-step governance walkthrough in DEPLOYMENT.md and dongle-smartcontract/README.md.

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature causing existing functionality to change)
• Refactoring / Documentation update

Changes Made

• Extended scripts/invoke.sh with proposal payload helpers (add_admin, remove_admin, set_threshold, set_fee, verification actions) and approve_proposal / execute_proposal / get_proposal.
• Added a post-deploy governance section to DEPLOYMENT.md covering bootstrap, create, approve, and execute.
• Added matching step-by-step examples under Admin Management in dongle-smartcontract/README.md.

Acceptance Criteria

• Example invocations exist for create_proposal, approve_proposal, and execute_proposal.
• DEPLOYMENT.md includes step-by-step script examples for governance operations.
• dongle-smartcontract/README.md includes the same workflow using invoke.sh.

Test Coverage

• bash -n scripts/invoke.sh

Related Issues

Closes #510

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