Add regression test for set_operator(operator) where operator equals the current admin address

[Jagadeeshftw]

📌 Description

set_operator accepts any Address with no check against the current admin. If the admin appoints itself as operator (set_operator(admin_address)), require_admin_or_operator's is_admin || is_operator check becomes trivially true either way, but it is worth confirming this dual-role configuration behaves correctly and doesn't, for example, produce confusing event data or double-count in any future operator-scoped view.

🧩 Requirements and context

• Add a regression test appointing the current admin as its own operator via set_operator(admin_address).
• Assert is_operator(admin_address) returns true and pause/unpause/extend_instance_ttl still succeed when authorized as that address.
• Assert require_admin-only entrypoints are unaffected (the admin retains full authority independent of also holding the operator role).

🛠️ Suggested execution

• Add the test to src/test.rs alongside existing operator-role coverage.
• No production code changes expected unless the test surfaces an actual bug in is_operator/require_admin_or_operator.
• Document that a dual admin/operator role is a supported (if redundant) configuration in the README's operator section.

✅ Acceptance criteria

• A regression test confirms set_operator(admin_address) succeeds and leaves both admin and operator authority intact for that address.
• The test would catch any future regression that assumes admin and operator are always distinct addresses.
• README documents the dual-role configuration as intentionally supported.

🔒 Security notes

Assuming admin and operator are always distinct addresses in future code (e.g. an event or audit-log design that dedupes by role) could silently drop information about a legitimate dual-role configuration; this test guards the current, permissive behavior explicitly.

📋 Guidelines

• Minimum 95% test coverage
• Clear documentation
• Timeframe: 96 hours

[d3v-active]

I would like to work on this issue because i am confident i can resolve the issue, having worked on and resolved similar issues. my eta is 4 hours

[github-actions]

Assigned @d3v-active to this issue via repo automation. Please open a PR referencing this issue (e.g. Closes #133) when you're ready.

[grantfox-oss]

🦊 GrantFox — @d3v-active has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #133)
2. Your PR will be reviewed by the AnchorNet-Org maintainers

Good luck! Track your progress on GrantFox.

[Jagadeeshftw]

Thanks for applying here. Please also join our Telegram group here: https://t.me/+vTbe0hOUKrFhNTJl. It helps us keep communication clear while we review contributions.