v0.1.23

Added

• feat(backend): add GitHub status monitoring to git_watcher
• feat(github): GitHub PR/issue tracking and merge sheet

Fixed

• fix(agent): satisfy clippy manual_is_variant_and on Rust 1.98

Other

• refactor(github): polish PR service, types, and test suites
• refactor(ui): update app root, spotlight, and terminal grid for GitHub integration
• refactor(core): update config and worktree module setup