Adds the macOS photos-helper Swift CLI (PhotoKit listing with stable
cursors, persistent change tokens, iCloud-aware original export with a
path guard and SHA-256) plus XCTests for its PhotoKit-free core, and the
Electron main-process side: a validated helper client, a resumable
metadata push and chunked original upload against the media contract,
and IPC handlers that stay unavailable off macOS.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138YqDj3ttfayRwuMKKrqVj
d3c6f262ad