M0 established the desktop baseline
The shell, builders and editor spike passed their Windows and Linux gates; this was not a public release.
M0 built the repository and contract foundation, the Electron shell, design tokens and platform builders. It also measured a CodeMirror 6 editor spike against the project’s reference books.
What the gate established
The Windows and Linux installers started, and both platforms updated from a test release. The editor measurements were recorded against the performance targets. The macOS builder script exists, but its build, startup, download notice and measurements remain part of the later macOS verification.
What it did not establish
M0 did not complete the book workflow or produce a signed 1.0 release. M1 is the current milestone. Every build before 1.0 is an unsigned pre-release, and no public artifact is listed on the Development page.