What's Changed

• Add browser focus mode by @lawrencecchen in #4573
• Fix Claude hook transcript scaling and Sparkle update packaging by @lawrencecchen in #5202
• Tighten localization audit instructions by @lawrencecchen in #5217
• Support browser mouse back and forward buttons by @lawrencecchen in #5197
• Mark markdown-viewer bundles as vendored/generated for Linguist by @lawrencecchen in #5212
• Reject workspace socket window alias params by @lawrencecchen in #5195
• Markdown viewer: font-size popover controls by @lawrencecchen in #5168
• Revert terminal text context menu by @azooz2003-bit in #5230
• Organize extension SDK boundaries by @azooz2003-bit in #5085
• Refactor: extract Sparkle self-update into CmuxUpdater package (WIP) by @azooz2003-bit in #5132
• Inject FocusLogStore instead of a shared singleton by @azooz2003-bit in #5239
• Isolate browser WebKit process pools by @lawrencecchen in #4987
• Share bounded transcript tail reads across agent hooks by @lawrencecchen in #5218
• Fix file-editor arrow-key navigation and add a word-wrap setting (#5227) by @austinywang in #5247
• Fix workspace-group "Delete Group" context-menu no-op by @austinywang in #5253
• Web: APNs push notification backend hardening by @lawrencecchen in #5215
• Render diff viewer empty state instead of raw error (issue #5246) by @austinywang in #5252
• Open group config in the user's configured editor by @austinywang in #5250
• Move v2 read-text scrollback work off main actor by @azooz2003-bit in #5243
• Fix Claude workflow resume transcript resolution by @azooz2003-bit in #5242
• Fix remote SSH file browser opening by @azooz2003-bit in #5241
• Fix tagged sidebar extension discovery by @azooz2003-bit in #5267
• Extract CmuxFileWatch and consolidate file watchers (modular refactor, wave 2) by @azooz2003-bit in #5244
• Fix browser address bar: single click places caret instead of selecting all (#5268) by @austinywang in #5270
• Fix #5255: shared markdown/file-preview text editor hang (force TextKit 1) by @austinywang in #5257
• Fix macOS "access data from other apps" prompt on agent session start/quit (#5146) by @austinywang in #5176
• Fix Codex auto-resume emitting invalid -s disabled (#5262) by @austinywang in #5276
• Vibe-codable custom sidebars (runtime Swift interpreter), behind a beta flag by @azooz2003-bit in #5254
• Fix copy-mode vim keys swallowed under non-ASCII input sources (Korean, Japanese Kana, Zhuyin) by @pstanton237 in #5292
• Fix #5269: recover terminal focus when first responder is stranded in another window by @lawrencecchen in #5296
• Add Open Current Directory in Devin Command by @MaxiAschenbrenner in #5288
• Fix stale sidebar git branch after cd out of a repo into a non-git dir by @austinywang in #5279
• Web: send APNs host groups concurrently by @lawrencecchen in #5258
• Fix #5302: leaked settings observation tasks grow heap to 4.4 GB over ~23h by @austinywang in #5310
• Add SSH agent forwarding support for cmux ssh by @austinywang in #5301
• Fix restored cwd bindings after reboot by @austinywang in #5307
• Anchor textbox autocomplete to the cursor by @lawrencecchen in #5021
• Showcase awesome-cmux projects on community page by @lawrencecchen in #4905
• Fix TextBox teardown crash when toggling sidebar background by @austinywang in #5317
• [codex] Fix nonblocking workspace close teardown by @azooz2003-bit in #5316
• Fix #5303: stop browser pane re-running one-time setup on every CoreAnimation commit by @austinywang in #5311
• web: download confirmation page + shared same-tab download CTA by @austinywang in #5319
• Add brand assets page by @lawrencecchen in #5256
• Web: harden production security headers by @lawrencecchen in #5334
• Add CLI validation and reload for custom sidebars by @lawrencecchen in #5327
• Fix WebKit post-wake crash: sleep/wake-aware hidden-webview discard scheduling by @azooz2003-bit in #5315
• Fix terminal selection mouse-up with find overlay by @lawrencecchen in #5335
• Fix TextBox IME and input-source handling by @lawrencecchen in #5340
• Lazy load file explorer roots by @lawrencecchen in #5342
• Fix agent session resume: cwd-drift + post-kill cwd, DRY resume engine, lifecycle/fork tests by @lawrencecchen in #5312
• Fix session restore resuming agents in the wrong directory (drifted cwd) by @lawrencecchen in #5300
• Tighten community project listing by @lawrencecchen in #5324
• Add live status reporting to the Amp Neo session plugin by @HamptonMakes in #5235
• Fix #753: stop cmux launching under Rosetta on Apple Silicon by @austinywang in #5306
• Fix sidebar workspace frame collection virtualization by @austinywang in #5325
• Fix terminal copy mode cursor navigation by @austinywang in #5328
• Fix printable Option key shortcut routing by @austinywang in #3981
• Make agent hook feed telemetry nonblocking by @lawrencecchen in #5320
• Fix release appcast R2 upload: provide GH_TOKEN to gh release list by @austinywang in #5116
• Release v0.64.13 by @austinywang in #5354
• Respect transparent Ghostty backgrounds in browser blank tabs by @lawrencecchen in #5203
• Revert "fix(release): set GH_TOKEN on appcast R2 upload step" by @austinywang in #5355

New Contributors

• @MaxiAschenbrenner made their first contribution in #5288
• @HamptonMakes made their first contribution in #5235

Full Changelog: v0.64.12...v0.64.13