fix(build): HTTPS scholix.org link; gitignore session HANDOFF.md

Author: jt14den

.gitignore

@@ -59,3 +59,4 @@ dev/slide_assets/
 # Local design/planning scratch notes (kept out of the lesson; dev/research/ is tracked)
 dev/design/
 dev/notes/
+HANDOFF.md

episodes/improving-metadata-discoverability.md

@@ -254,7 +254,7 @@ Some funders (NSF, NIH, Wellcome Trust) have specific deposit requirements. Chec
 
 When you deposit software on Zenodo, the record flows into:
 
-- **DataCite**: the DOI registration agency for research data and software; DataCite records are harvested by library catalogs, institutional discovery systems, and tools like [OpenAlex](https://openalex.org/) and [Scholix](http://www.scholix.org/)
+- **DataCite**: the DOI registration agency for research data and software; DataCite records are harvested by library catalogs, institutional discovery systems, and tools like [OpenAlex](https://openalex.org/) and [Scholix](https://www.scholix.org/)
 - **Google Scholar**: picks up Zenodo records with structured metadata
 - **Library catalogs**: many discovery layers (EBSCO, Ex Libris Primo, OCLC WorldCat) harvest DataCite metadata, meaning your software can appear in a library search alongside journal articles
 - **Domain repositories** that harvest DOIs