First updater-enabled beta

Highlights

• This is the first beta that ships Cogito's built-in Check for Updates… flow.
• Existing 0.1.0 testers should replace the app manually one last time to get onto the updater track.
• Public release metadata, ZIP signatures, and the production appcast now ship from the reviewed release file.
• Sidebar browsing stays symlink-aware and the top chrome is calmer during scroll-heavy note work.

New

• Release builds now embed Sparkle 2 and expose Check for Updates… from the app menu.
• cogito.md/updates/appcast.xml now serves the production updater feed from imported release data.
• Public release ZIPs now carry Sparkle EdDSA signatures so in-app updates can verify the downloaded build before install.

Improved

• Sidebar top chrome and its scroll fade are quieter and less distracting during longer browsing sessions.
• Header and sidebar symlink badges are more consistent with the note path state Cogito preserves while browsing.
• The public release pipeline now generates updater-ready metadata from the same reviewed release file used for the website release notes.

Fixed

• Browser and document state now preserve symlink-aware paths more reliably instead of collapsing them back to resolved filesystem paths.