Summary

• move the interactive app loop into dedicated app and usecase modules while keeping the legacy command API compatible
• split shared responsibilities into adapters, domain helpers, and focused usecases, including repo discovery and worktree locking
• refresh architecture and agent docs, and add regression coverage for hook execution and help output

Verification

• cargo fmt --check
• cargo clippy --all-features -- -D warnings
• cargo test --all-features -- --test-threads=1
• compared current branch against main by running the full test suite on both branches
• compared CLI behavior for --version, --help, search, batch delete, cleanup old worktrees, and edit hooks on both branches