The register map, kept locally without keeping it in the repo

The Anker Modbus reference page is published as an artifact and lives in the
project root as a working copy. It is generated rather than authored, and the
published page is the one that gets updated, so tracking the local copy would
only invite the two to drift apart in review.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitignore

@@ -15,3 +15,6 @@ Thumbs.db
 # Secrets
 .env
 *.env.local
+
+# Local reference copy of the published Anker Modbus map artifact
+anker-modbus-map.html