chore: add LocalRepos.md to gitignore and sync rule to CLAUDE.md

LocalRepos.md stores paths to local repos that should be kept in
sync when CI/CD documentation is updated. Added mandatory rule
to CLAUDE.md to propagate relevant changes.

.gitignore

@@ -1 +1,2 @@
 .claude/
+LocalRepos.md

CLAUDE.md

@@ -3,3 +3,7 @@
 ## MANDATORY: Keep README in sync
 
 When adding, removing, or renaming any file in this repository, **update README.md** to reflect the change. The README serves as the index of all repository contents — every document must be listed there with a short description. Also update the "Last updated" date in README.md to the current date.
+
+## MANDATORY: Keep local repos in sync with CI/CD docs
+
+If `LocalRepos.md` exists, read it after updating any CI/CD-related documentation (e.g., `gitea-python-ci-cd.md`, `windows-code-signing.md`). For each listed repo, check whether the change applies to that project's CI workflows, build scripts, or installer configuration — and propagate relevant updates (e.g., NSIS patterns, VBS launchers, workflow fixes, troubleshooting notes) to the corresponding files in those repos.