cv/regen.sh: document that this is for local testing only

The production cv-build workflow (mb-westover/cv-build, private) now
regenerates the JPEG previews and updates the page count in index.html
automatically on every Sunday run. This script is kept around for the
narrow case of testing locally how a CV PDF change renders before
pushing — clarifying that in the file header so future readers don't
think they need to run it after each CV update.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mb-westover

cv/regen.sh

@@ -1,7 +1,18 @@
 #!/usr/bin/env bash
 # Regenerate cv/pages/*.jpg from cv/1-Westover_CV.pdf and update the page
-# count in cv/index.html. Run this whenever the CV PDF is updated.
+# count in cv/index.html.
 #
+# === FOR LOCAL TESTING ONLY ===
+# The production CV pipeline (private repo: mb-westover/cv-build) runs every
+# Sunday, rebuilds the PDF + DOCX, regenerates the 44 JPEGs in this folder,
+# and updates the page count in index.html automatically. You do NOT need to
+# run this script after editing the source Google Docs/Sheets — the cloud
+# workflow handles it.
+#
+# Use this script when you want to verify locally how an updated PDF will
+# render before pushing, e.g. after testing a pipeline change in build_cv/.
+#
+# Usage:
 #   ./cv/regen.sh
 #
 # Requires: pdftoppm (brew install poppler).