fix(build): support VS 2026 CRT layout

[dh0er]

Summary

• discover the single app-local MSVC CRT family inside the exact CMake-selected Visual Studio redist version
• support both Visual Studio 2022 VC143 and Visual Studio 2026 VC145 layouts
• fail closed before signing when the CRT family is missing or ambiguous

Verification

• python -m unittest scripts.test_build_runtime -v (9/9)
• python -m unittest discover -s scripts -p test_*.py (50/50)
• python scripts/check_release_workflow.py
• git diff --check

Fixes the non-publishing Mod Manager RC smoke-build failure in Actions run 31631888357. All quality gates in that run were green; packaging failed before verification/upload because the VS 2026 runner no longer uses the hard-coded Microsoft.VC143.CRT leaf.

---

Note

Medium Risk
Changes release packaging for gore-mod-manager only, but failures are fail-closed before signing and the behavior is heavily unit-tested; wrong CRT selection would break portable/installer builds on CI.

Overview
Fixes Mod Manager Windows packaging on Visual Studio 2026 runners, where the app-local MSVC runtime path is no longer a fixed Microsoft.VC143.CRT leaf.

build.py adds _msvc_crt_dir to scan the x64 redist directory for exactly one real Microsoft.VC*.CRT directory (skipping symlinks/junctions), then uses that folder when staging msvcp140 / vcruntime140 DLLs. Resolution is tightened so the chosen CRT directory must stay under its redist x64 folder.

scripts/test_build_runtime.py parametrizes the fake VS layout (toolset, redist version, CRT family), adds a VC145 staging test, and asserts missing or duplicate CRT families raise before sign_paths runs and leave the bundle unchanged.

^{Reviewed by Cursor Bugbot for commit 08f2a37. Bugbot is set up for automated code reviews on this repo. Configure here.}

[dh0er]

@codex review

Fresh review requested on unchanged head 08f2a37 after the prior reviewer window returned no Codex signal. Trigger: 2026-08-12T20:26:24.8998577Z

[dh0er]

@cursor review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

Reviewed commit: 08f2a37e64

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 08f2a37. Configure here.}

[dh0er]

@codex review

[dh0er]

@cursor review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: 08f2a37e64

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 08f2a37. Configure here.}