Desktop: render the macOS-first workbench shell #129

Goal

Render the first usable macOS-first desktop workbench shell on top of the secure Electron process boundary.

Parent

• Desktop: launch a secure macOS session shell #106
• Roadmap Roadmap: macOS desktop workbench v1 #105

Scope

• Add a native-feeling project and session rail, main workbench, inspector region, and fixed composer.
• Render explicit empty, loading, ready, and error states from a typed renderer model.
• Provide keyboard-focus landmarks and accessible names for the primary regions.
• Keep PTY execution, terminal continuity, Dynamic Workflow controls, settings, packaging, and CI workflow changes out of this slice.

Acceptance criteria

• Focused tests prove the semantic regions and all renderer states.
• The Electron window renders the workbench from local application assets under the existing hardened BrowserWindow contract.
• Build, typecheck, unit, integration, and smoke verification pass.
• The PR includes a head-SHA-bound tmux terminal verification receipt.

Source

• source:user
• Derived from Desktop: launch a secure macOS session shell #106 and roadmap Roadmap: macOS desktop workbench v1 #105.