Add tests for context destructuring in check_permissions.cjs

[Copilot]

Added test coverage for the nested destructuring pattern introduced in the previous refactoring:

const { eventName, actor, repo } = context;
const { owner, repo: repoName } = repo;

New Tests (4)

• Custom owner/repo extraction - Validates nested destructuring correctly extracts owner and repoName from context.repo
• Different repo name variations - Tests permission checks with various owner/repo/actor combinations
• Safe event destructuring - Verifies destructuring works in early-return paths (workflow_dispatch, schedule, merge_group)
• Special characters in repo names - Ensures hyphens and underscores in repo names are handled correctly

Coverage: 18/18 tests passing (14 original + 4 new)

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