Harden Windows packaged releases

[wimi321]

Summary

Harden Windows packaged releases for GoAgent v0.4.15.

• isolate Electron user-data/cache state from legacy AppData profiles
• disable the Electron UI GPU path on Windows while leaving KataGo NVIDIA/OpenCL analysis intact
• make Lite packages warn, not block, when bundled KataGo is absent
• inspect packaged runtime paths from resources/app.asar and resources/data/katago instead of source-tree paths
• add Standard/Lite/NVIDIA Windows packaged-app smoke checks before release artifact upload
• add v0.4.15 multilingual release notes

Validation

• node --test tests/sprint4-release-contract.test.mjs tests/lite-release-contract.test.mjs tests/nvidia-release-contract.test.mjs tests/katago-official-install-contract.test.mjs tests/katago-runtime-path-contract.test.mjs
• node scripts/check_release_notes_i18n.mjs
• node scripts/check_nvidia_release_assets.mjs
• node scripts/check_lite_release_assets.mjs
• node scripts/smoke_windows_packaged_app.mjs against downloaded v0.4.14 standard package reproduced the old packaged readiness bug while confirming KataGo itself was ready

Notes

Local full typecheck/build could not be completed in the previous sandbox because pnpm/node_modules access was blocked by EPERM. CI should run the full matrix on this branch.