feat: prototype minimal agent desktop

[RestartFU]

Summary

• replace the primary desktop surface with a minimal project/session shell inspired by Spotify Portal
• run Codex and Claude as direct interactive CLIs inside durable daemon-owned PTYs
• make Local and Remote mutually exclusive persisted runtime modes, with connect/disconnect from the home screen
• add persisted Dark, Light, and Warm themes
• publish an isolated rolling desktop-only dev build on every push to this branch

The legacy file/editor surfaces remain compiled for now but are not mounted by the minimal desktop. The mobile client and mobile workflow are unchanged.

Reliability work included

• answer terminal capability/color/status queries so the bundled Codex TUI can start headlessly
• sequence terminal snapshots and deltas, merge reconnect races, and prevent stale terminal resurrection
• serialize direct CLI starts, managed turns, and chat deletion per session
• keep dev installs, settings, app IDs, update feed, and artifacts isolated from stable and nightly on Linux, macOS, and Windows

Verification

• ./scripts/test.sh
• 84 desktop library tests and 149 desktop app tests
• 152 daemon library tests and 7 daemon binary tests
• Linux release builds and Windows desktop/daemon cross-checks
• dev Linux bundle build and smoke test
• dev workflow actionlint and installer shell syntax checks
• bundled Codex direct-PTY smoke: sign-in UI rendered and accepted keyboard navigation

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