fix(desktop): restore Windows managed runtime startup

[killswitch-GUI]

Summary

Fixes #145.

This branch gets the Windows desktop Managed Local runtime from the reported bootstrap failure to a working dev and packaged-app launch path.

• fixes Windows sidecar/runtime startup under Desktop, including verified path handling, cleared-environment temp roots, Windows endpoint persistence, and loopback public API startup
• adds Windows lifecycle/bootstrap coverage for the deterministic sidecar reproduction named in issue Windows Desktop managed runtime fails during sidecar bootstrap and loopback bind #145
• adds private desktop development homes and Codex CLI discovery in scripts/desktop-dev.ps1
• improves desktop Codex auth safety/error handling and Windows workspace display paths
• fixes onboarding row layout polish discovered during the Windows desktop smoke pass

Validation

• cargo xtask check rust
• cargo test --locked -p colossus-sidecar --test windows_lifecycle verified_sidecar_bootstraps_pinned_grpc_runs_echo_and_closes -- --exact --ignored --nocapture
• npm run test:browser passed 19/19
• npm run format:check
• desktop Tauri lib tests: 160 passed, 1 ignored
• rebuilt NSIS installer and launched installed colossus-desktop.exe through the native onboarding/provider/offline self-test flow
• scripts/desktop-dev.ps1 smoke reached target\debug\colossus-desktop.exe and stayed up past the previous panic point

Desktop evidence

Installer tested:

apps/desktop/src-tauri/target/x86_64-pc-windows-msvc/release/bundle/nsis/Colossus Desktop_0.1.0_x64-setup.exe

SHA256:

B223A15892E4E59F372ECF5057CD5B29423D0B577E3933FDBFA54AB268CBDF69

Captured Windows smoke screenshots are in the local ignored target/desktop-e2e/ evidence folders from the Codex task.

[chatgpt-codex-connector]

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