For anyone actually reviewing this, the PC/layout/README.md file is an addition, not a removal, but it's hard to find in the diff view. Initial contents are here but that link won't update with new commits.

A bunch of suggestions from Claude:

Orphaned build files (clear removals)

• PCbuild/pyshellext.vcxproj and PCbuild/pyshellext.vcxproj.filters — the sources
  (PC/pyshellext.cpp/.def/.rc) were deleted and the project was already dropped from
  pcbuild.sln/pcbuild.proj, so these two files are dead.
• PCbuild/venvlauncher.vcxproj.filters:17 and PCbuild/venvwlauncher.vcxproj.filters:22
  still reference the deleted ..\PC\pylauncher.rc; the .vcxproj files were updated to
  python_exe.rc, but the .filters weren't.

References to deleted files

• README.rst:79-80 — links to the deleted Tools/msi/README.txt ("To build Windows
  installer, see …").
• PC/store_info.txt:30,46 — instructions call the deleted Tools/msi/make_appx.ps1.
• .github/CODEOWNERS:192-193,196 — entries for Tools/msi/, Tools/nuget/, and
  PC/launcher.c.
• .gitignore:53,161 — Tools/msi/obj and the "not Tools/msi/core" comment.
• .gitattributes:22 — PC/classicAppCompat.* binary (the files are gone; appxmanifest.py
  deliberately keeps runtime logic for older releases, but the attribute is dead).
• PCbuild/readme.txt:143-160 — still documents the pylauncher, pywlauncher, and
  pyshellext sub-projects.

Dead CI/tooling logic

• Tools/build/compute-changes.py — the whole run_windows_msi path (lines 120, 163-164,
  226, 248-250, 291-293, 330, 345) triggers on the deleted reusable-windows-msi.yml and
  Tools/msi/; build.yml/reusable-context.yml no longer consume it. The matching test data
  in Lib/test/test_tools/test_compute_changes.py:114-115 too.
• .azure-pipelines/windows-layout-steps.yml:15 — -i test_launcher excludes a test that no
  longer exists.

Stale doc/comment pointers to PC/launcher.c

• Include/internal/pycore_magic_number.h:314 — "PC/launcher.c must also be updated"
  (magic-number bump instructions).
• InternalDocs/interpreter.md:312 — same note, with a link to the deleted file. These
  presumably should now point at the launcher's new home (pymanager) or be dropped.

Thanks, Claude (I wish we hadn't turned off Copilot reviews here, at least those would come with suggestions that I could batch and commit from the UI...)

Also a couple of docs sections that could be removed; or possibly just keep the red "Deprecated since version 3.14" paragraph, change the tense, and update deprecated:: 3.14 to deprecated-removed:: 3.14 3.16:

• 4.11. The full installer (deprecated)
• 4.12. Python launcher for Windows (deprecated)