html_export_code_reference_pages

Html export should generate dedicated pages for outbound file_reference targets that are not idea-hosting reqlan files already covered by html_export_file_pages.
Code-file pages should list referencing ideas and reference labels, and participate in search and navigation.
Emission defaults on and is controllable via includeCodeFilePages so this page family can be flagged in or out later.
Outbound reference path cells and graph external file nodes should link to these pages when enabled.

Interactive page: html_export_code_reference_pages