migrate: add Tauri shell and Rust core

[boggedbrush]

Summary

Adds the first Tauri migration slice beside Electron while preserving the React renderer and Python FastAPI backend. Introduces a small Rust local operations core invoked by Python through JSON stdin/stdout.

Changes

• Add Tauri host under src-tauri with native commands, window controls, dialog bridge, and Python sidecar supervision
• Add renderer desktop adapter that prefers Tauri and falls back to Electron/web
• Add patchops-core Rust crate for status, hash, scan-steam, and read-config
• Add backend core_bridge.py and minimal /api/status integration with Python fallback
• Add Tauri build/package scripts, sidecar verification, Windows/Linux CI workflows, and release workflow artifact wiring
• Add Rust, Python, and renderer tests plus README migration docs

Testing

• bun run test:renderer
• bun run typecheck
• cargo test -p patchops-core
• cargo test -p patchopsiii-tauri
• .venv\Scripts\python.exe -m unittest backend.test_core_bridge backend.test_api_status_core
• bun run check:tauri-version
• bun run verify:tauri-sidecars
• bun x tauri build --bundles msi
• Local packaged Windows smoke: /api/health, /api/status, /api/game-directory, Rust-backed status fields, settings write, clean shutdown

Notes

• Electron remains in place as fallback during migration
• Python remains the orchestration/API layer; install and uninstall flows are not moved to Rust
• Tauri workflows are added for native Windows MSI and Linux AppImage validation

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Reap spawned URL opener processes

open_external_url spawns rundll32/open/xdg-open and immediately drops the Child handle without waiting or reaping it. On Unix, Rust does not auto-wait dropped children, so each external-link click can leave a zombie until the app exits, which can accumulate in long-running sessions and eventually exhaust process table resources. Please either wait/reap in a background task or use a launch path that does not leave unreaped children.

Useful? React with 👍 / 👎.