Add macOS support specification and implementation roadmap#2
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Design for running ember on macOS using Apple Virtualization Framework (instead of Firecracker), APFS clones (instead of ZFS), and vmnet shared mode (instead of TAP+iptables). Includes backend trait architecture for compile-time platform selection and a phased implementation plan. https://claude.ai/code/session_01KZHZYm4XHXuZYeFq8jWnrK
Add a spec section and TODO items for verifying that APFS copy-on-write actually saves space (since du/Finder report clones at full size). Includes: - `ember debug storage-efficiency` command (logical vs actual disk usage) - APFS volume validation during `ember init` - `cp -c` failure detection with clear error messages - Timing-based sanity check on clone operations https://claude.ai/code/session_01KZHZYm4XHXuZYeFq8jWnrK
Point at MACOS-SPEC.md and MACOS-TODO.md as the current focus. Update architecture section with backend trait structure and platform annotations. https://claude.ai/code/session_01KZHZYm4XHXuZYeFq8jWnrK
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Summary
This PR introduces comprehensive design documentation and implementation roadmap for macOS support in ember. Rather than porting Linux-specific tools (Firecracker, ZFS, iptables), the design leverages native macOS frameworks and tools to provide an identical CLI experience.
Key Changes
MACOS-SPEC.md: Complete technical specification for macOS support covering:
ember-vz, a Swift helper binary that shells out to AVF (matching ember's philosophy of using platform tools)MACOS-TODO.md: Phased implementation roadmap with 7 phases:
Updated CLAUDE.md: Clarified project scope (Linux + macOS), added macOS-specific guidance, updated architecture overview to reference both SPEC.md and MACOS-SPEC.md
Updated PROMPT.md: Redirected to MACOS-TODO.md as the current task list
Notable Design Decisions
ember-vz(Swift CLI) handles AVF complexity, matching ember's existing pattern of shelling out tozfs,iptables, etc.ember debug storage-efficiencycommand and timing-based sanity checks since APFS doesn't expose per-file CoW savings like ZFS does#[cfg(target_os)]for clean separation without runtime overheadhttps://claude.ai/code/session_01KZHZYm4XHXuZYeFq8jWnrK