feat(cli): add root command

Forgot to add these

feat: Reimplement Swift A4 Core library for byte-for-byte parity with Rust (#13)

feat: Improve Git sync to automatically handle non-conflicting divergences (#12)

feat: Implement A4 protocol - personal knowledge base system (#11)

feat: Add complete Swift implementation of Aethel-Core with all golden tests passing (#10)

Add golden tests for aethel init command (#9)

fix: Update GitHub Actions workflow to use correct mise-action (#8)

refactor: DRY up CLI command execution with utility function

fix: Resolve path issues in add_pack golden test harness

refactor: Implement robust line-based Markdown front-matter parser

fix: Remove std::process::exit(1) and standardize error output to stderr

Move documentation files to docs/ directory

Fix mise rust version

Implement golden test framework and test cases