v1.2.1

[1.2.1] - 2026-10-20

Added

• A drag-to-install DMG and a packaging command that verifies the mounted application and generates a SHA-256 checksum.
• An editable SVG source for the existing icon design and a generator that renders every PNG size directly from that source.
• Shared AGENTS.md development guidance, migrated from the local Claude-specific guide, including documentation and repository-scope conventions.

Changed

• Regenerate the README image and all macOS app icon PNGs from the vector source, preserving the asset catalog's existing filenames and size mappings.
• Keep local experiments, editor preferences and release working notes out of the repository. Restore the original bilingual README layout with current feature and installation details.

Distribution Notes

• Version 1.2.1 (build 3) retains the macOS 12+ Apple Silicon target and the same screenshot implementation as 1.2.0. Only macOS 27.2 has interactive validation evidence; older systems and external/mixed-scale displays remain unverified.
• Local release candidates use Apple Development signing and are not notarized. The undocumented native screenshot integration and distribution limitations described under 1.2.0 still apply.