Reapply "delete file, explain this abomination"

This reverts commit a1016dd.

Author: ebsmothers

.github/packaging/build_for_ci.sh

@@ -1,3 +1,10 @@
+# These requirements were generated by running steps 1-3 of scripts/build_wheels.shell
+# then running pip freeze and manually removing the vllm dependency.
+# The intention of this file is to use these known requirements for a fixed
+# vLLM build to supplement a vLLM install from download.pytorch.org without
+# resorting to --extra-index-url https://download.pytorch.org/whl/nightly to find
+# vLLM dependencies (as this results in a ResolutionTooDeep error from pip).
+# TODO: this should be done way less hackily
 aiohappyeyeballs==2.6.1
 aiohttp==3.13.0
 aiosignal==1.4.0