Fix NVIDIA NVRTC bundling and require clean KataGo startup

[wimi321]

Summary

The current v0.4.21 Windows NVIDIA bundle contains KataGo 1.17.1 but omits its directly imported nvrtc64_120_0.dll. The official portable archive (SHA-256 7b52ab7e87e3356c22f28ec028bb7c91f2e825f9e78ddcb894f0d313ab2ac8a8) returns loader status 0xC0000135 for katago.exe version. Adding the official CUDA 12.1 NVRTC pair makes that same binary exit 0; withdrawing it reproduces the failure. The official NSIS payload also fails the new dependency check for the same missing DLL.

• Supplement the source runtime with NVIDIA's official NVRTC 12.1.105, verifying the archive, both DLLs and unchanged license against pinned SHA-256 values. Preserve provenance and the full license beside the existing notices.
• Check the x64 PE normal/delay import closure and explicit NVRTC builtins. Run the actual engine with an empty working directory, cleared environment and Windows-only PATH, requiring executable version output and exit 0. Embedded metadata / GPU-less smoke exemptions cannot satisfy this gate.
• Gate afterPack, NVIDIA app smoke, and both final portable and NSIS payloads before release upload. Extract NSIS without executing the installer.
• Add a Windows CI regression using the hash-pinned broken official portable release: reject the original package, supplement NVRTC, then require clean startup.
• Import Arch from the declared electron-builder dependency so the packaging hook works under pnpm's isolated dependency layout.

Fixes #58.

Verification

• Full Node regression suite: 267/267 passed (including five new behavioral dependency/archive tests).
• Node and renderer TypeScript checks; application build.
• NVIDIA release workflow contract and YAML parsing.
• Isolated current-source Windows NSIS build; current afterPack gate.
• Freshly extracted isolated portable 7z and NSIS app-64.7z payload: dependency/license checks pass and clean version probes return 0 / KataGo 1.17.1 / CUDA.
• Both unchanged official v0.4.21 NVIDIA artifacts are rejected for missing NVRTC.
• Exact head 75c96473e7f3be817eb129433221268c4479dac2: CI run 37115875671 passed all five jobs, including NVIDIA clean startup and Windows/macOS/Linux package checks; P0 RC run 37115875660 passed both jobs.
• GPU model initialization, actual analysis and interactive app/installation QA.

Notes

The NVRTC LICENSE is byte-identical to the CUDA Runtime license already shipped; its Attachment A lists NVRTC and builtins as distributable components under the existing distribution terms. No new license acceptance, global CUDA installation, system PATH/driver/security change, existing installation replacement, GPU analysis, merge or release was performed.

Local artifacts are isolated test builds, not published installations. The local portable archive uses compression level 1 to limit CPU time; release compression remains level 7. This validation concerns packaged KataGo loader/startup behavior, not complete application or GPU QA. See docs/WINDOWS_NVIDIA_RUNTIME.md for official sources, hashes, checks and limits.

Based on main 6debe9e431a6761c003f05c975c0a9b8d37f8fbc. PR #61's commentary changes are not included.