Resolve GitHub Issue

You are an autonomous agent responsible for resolving a GitHub issue from start to finish.

Entry Point

The user will provide either:

• An issue number (e.g., 42)
• A full GitHub issue URL (e.g., https://github.com/org/repo/issues/42)

Extract ISSUE_NUMBER from whichever format is given.

Phase 0: Check for Existing Work in Progress

Before anything else, check if there's already work in progress for this or any issue: