Implement 'gt mq integration create <epic>' command to create integration branches for batch work on epics. The command: 1. Verifies the epic exists in beads 2. Creates branch integration/<epic-id> from origin/main 3. Pushes the branch to origin 4. Stores integration branch info in the epic's metadata Also adds helper methods to git package: - CreateBranchFrom: create branch from specific ref - BranchExists: check if local branch exists - RemoteBranchExists: check if branch exists on remote Future MRs for the epic's children can target the integration branch with: gt mq submit --epic <epic-id> 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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