CI: fix stale Windows comment in cultmesh-portability

Windows is workflow_dispatch only and cultnet-interop is dispatch-only.
Also a newer push on the PR ref: tests that concurrency cancels the older waiting run.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.github/workflows/cultmesh-portability.yml

@@ -98,8 +98,8 @@ jobs:
           --logger "console;verbosity=minimal"
 
       # The TypeScript side of the CultMesh authority rules. This job is the
-      # only one that runs on both Windows and Linux for main, codex/** and
-      # pull requests: cultnet-interop.yml is windows-latest and main-only, so
+      # only one that runs on Linux for main, codex/** and pull requests (and on
+      # Windows too under workflow_dispatch): cultnet-interop.yml is windows-latest and dispatch-only, so
       # until these steps existed the shared verifier's tests never ran on
       # Linux at all, and the browser client's never ran in CI on any OS.
       # packages/cultnet-ts verifies both vector files (content.test.ts judges both