ci: make the self-hosted windows build manual-only

build-windows targets a self-hosted runner (Windows host + Linux docker images;
GitHub-hosted Windows runners cannot run Linux containers). Drop the push
trigger — it only queued-then-cancelled while the runner was offline — and the
pull_request trigger, which would let fork PRs execute on the self-hosted
machine. Hosted Windows coverage stays in test-core's windows lane.

Author: bugra9

.github/workflows/build-windows.yml

@@ -1,23 +1,11 @@
 name: build windows
+# Runs on a SELF-HOSTED Windows runner (label: Windows) with Docker Desktop running
+# Linux images — GitHub-hosted Windows runners cannot run Linux containers, so this
+# is manual-only: no push trigger (queued-then-cancelled noise while the runner is
+# offline) and no pull_request trigger (public repo: fork PRs must never execute on
+# a self-hosted machine). Hosted Windows coverage lives in test-core's windows lane.
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - main
-    paths:
-      - cppjs-core/**
-      - cppjs-extensions/**
-      - cppjs-packages/**
-      - cppjs-plugins/**
-      - cppjs-samples/**
-      - .github/workflows/build-windows.yml
-  pull_request:
-    branches:
-      - main
-    paths:
-      - cppjs-core/cpp.js/**
-      - cppjs-plugins/**
-      - .github/workflows/build-windows.yml
 
 permissions: {}
 jobs: