What's Changed

• Extract CmuxProcess command runner (modular refactor, wave 2) by @azooz2003-bit in #5093
• Codify modular-refactor rules into CLAUDE.md by @azooz2003-bit in #5111
• Add @LiveSetting: @State + store stream, reactive in the AppKit-hosted main window (all key kinds) by @azooz2003-bit in #5113
• Fall back to the default sidebar when extensions is disabled by @azooz2003-bit in #5127
• fix(release): set GH_TOKEN on appcast R2 upload step by @austinywang in #5139
• fix(cmuxd-remote): avoid E2BIG when startup script exceeds MAX_ARG_STRLEN by @lauzierj in #5133
• Stabilize git metadata FSEvents watcher by @azooz2003-bit in #5131
• Build release app with macOS 26 SDK by @lawrencecchen in #5042
• Honor Settings rebinding of Global Search (parse package object-form cmux.json bindings) by @austinywang in #5143
• Fix titlebar shortcut-hint pills clipped at bottom on macOS 26.5 by @lawrencecchen in #5145
• Rank visible title matches above hidden metadata in workspace switcher by @lawrencecchen in #5148
• Fix Claude fork/resume failing when session changed directories by @lawrencecchen in #5154
• Fix #5100: bound focus-surface broadcast re-entrancy (426s hang) by @austinywang in #5108
• Add font-size/zoom control to the markdown viewer by @lawrencecchen in #5163
• Improve terminal text context menu by @azooz2003-bit in #5135
• Gate Feed behind Beta Features (mirror Dock), default off by @austinywang in #5174
• Fix Web Inspector reopening after manual close + navigation (#5172) by @austinywang in #5180
• Restore right-click sidebar-button view switcher and built-in views (#5173) by @austinywang in #5182
• Fix restored scrollback keeping original theme's colors (white-on-white after theme change) by @austinywang in #5175
• Move diff viewer into React app source by @lawrencecchen in #5074
• Report remote PTY allocation failures loudly (#5185) by @austinywang in #5186
• Fix Starship prompt going static in bash sessions (#5164) by @austinywang in #5187
• Add a configurable keyboard shortcut to open the diff viewer by @austinywang in #5178
• Add cmux history blog post by @lawrencecchen in #5190
• Release v0.64.12 by @austinywang in #5204

New Contributors

• @lauzierj made their first contribution in #5133

Full Changelog: v0.64.11...v0.64.12