Set structured state when closing a listing

[ChimdumebiNebolisa]

Summary

Set canonical state: closed when closing a listing and make resolve_state honor active: false.

Problem

handle_close_opportunity only set active: false. README generation uses resolve_state, which previously returned the stored state field first, so a listing closed via automation could still render as OPEN in the README while the website showed it closed.

Changes

• Set state to closed in the close handler
• Treat active is False as closed in resolve_state
• Add regression tests for both paths

Validation

• python -m unittest discover -s .github/scripts -p "test_*.py" - 54 tests OK

Scope

No README or listings.json churn; repairs future close operations and any inconsistent records where active is false but state is not closed.