chore: test leader-key feature from PR manaflow-ai#1854

Continuation of 008ae36

TURN 1: User asks about keybinding customization in cmux; Claude explains the Settings UI supports 28 customizable actions with single-key combos.

TURN 2: User asks about chord/sequence keybindings like tmux; Claude explains cmux UI doesn't support this but Ghostty config does via key sequences.

TURN 3: User asks if anyone requested this feature; Claude finds multiple GitHub issues requesting leader-key/chord support, with manaflow-ai#1827 being most relevant.

TURN 4: User asks if anyone submitted a PR; Claude finds PR manaflow-ai#1854 by xiaocang adding tmux-style leader key mode with customizable actions and visual indicator.

TURN 5: User asks for PR URL; Claude provides manaflow-ai#1854.

TURN 6: User asks Claude to open it in browser; Claude opens the URL.

TURN 7: User asks how to test the PR instead of waiting for merge; Claude provides instructions for building from source and checking out the PR branch.

TURN 8: User asks Claude to perform checkout and initialization for staging use; Claude checkouts PR manaflow-ai#1854, attempts setup but hits Xcode version issues (needs 17+ for macOS 26 SDK).

TURN 9: User wants to install latest Xcode beta; Claude identifies Xcode 26.0 Beta 4 is latest and asks user to run installation command interactively.

TURN 10: User confirms Xcode installed; Claude verifies installation and asks to switch developer tools with sudo.

TURN 11: User confirms sudo command complete; Claude verifies Xcode 26.4 active, runs setup and build, resolves zig linker issues with macOS 26 SDK by using Xcode 16.4 for zig builds.

TURN 12: Background build task completes; Claude acknowledges successful build and confirms cmux STAGING is running with leader key feature.

TURN 13: User asks what the leader key is; Claude confirms Ctrl+B default and explains sub-key bindings (n/p for workspaces, numbers for jumps, etc.) and customization options.

TURN 14: User asks how to start the app since they closed it; Claude confirms it's back up and running.

OVERALL: User explored cmux keybinding customization, discovered PR manaflow-ai#1854 adding tmux-style leader key chording, and with Claude's help built and tested the PR branch in staging mode by installing Xcode 26 beta and resolving zig SDK compatibility issues.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ctrlShiftBryan

sessions/2026-03-21-0722-9e73eb28.md

@@ -1,7 +1,7 @@
 # Session 9e73eb28
 
 **Started:** 2026-03-21T11:22:32.037Z
-**Ended:** 2026-03-21T14:46:05.386Z
+**Ended:** 2026-03-21T14:48:20.789Z
 **Model:** Claude Opus 4.6
 **Cost:** unknown
 **Duration:** unknown
@@ -34,10 +34,10 @@
 
 ## Summary
 
-6 commits: feat(leader-key): add workspace navigation shortcuts, chore: workaround zig xcode 26 linker issues, done, chore: switch xcode-select to 26 beta, chore: install latest Xcode beta.
+7 commits: chore: restart cmux dev app, feat(leader-key): add workspace navigation shortcuts, chore: workaround zig xcode 26 linker issues, done, chore: switch xcode-select to 26 beta.
 
 ## Activity
 
 ### cmux (workspace)
-6 commits: feat(leader-key): add workspace navigation shortcuts, chore: workaround zig xcode 26 linker issues, done, chore: switch xcode-select to 26 beta, chore: install latest Xcode beta.
+7 commits: chore: restart cmux dev app, feat(leader-key): add workspace navigation shortcuts, chore: workaround zig xcode 26 linker issues, done, chore: switch xcode-select to 26 beta.