Following up on my question to the wiki-dev list, I received a response with some unattributed code for generating a table of contents for a wiki page:
// set aside the old prepare method
if (window.prepare) window.beforeTOCPrepare = window.prepare;
// now add our own, which calls the old one
window.prepare = function(inAlwaysRun) {
if (window.beforeTOCPrepare) beforeTOCPrepare(inAlwaysRun);
if ($(‘editable_content’)) gTOCGenerator = new TOCGenerator();
// also fix up the WLTEditor class so that it redraws the TOC when saving
if (window.gEditor) {
gEditor.beforeTOCEditorCleanElementForEditing = gEditor.cleanElementForEditing;
gEditor.cleanElementForEditing = function(inElement) {
gEditor.beforeTOCEditorCleanElementForEditing(inElement);
gTOCGenerator.remove();
}
gEditor.beforeTOCCleanElementAfterEditing = gEditor.cleanElementAfterEditing;
gEditor.cleanElementAfterEditing = function(inElement, inResponseDict) {
gEditor.beforeTOCCleanElementAfterEditing(inElement, inResponseDict);
gTOCGenerator.draw();
}
}
}
Simply copy and paste this code into a .js (JavaScript) file and save it to your theme’s folder structure: /Library/Application Support/Apple/WikiServer/Themes/[your_theme_name]/
I sincerely apologize for the formatting but I’m sick of fighting with WordPress to get it right! I’m no JavaScript expert so I do not know how the code works, but this can server as a starting point for future ToC development. For now, when the title of an article with multiple headings is clicked, a menu of the headings appears:

Apple Wiki Table of Contents using JavaScript
With more time and a little Headfirst: JavaScript, I might just have a solution that makes a dynamic, permanent Table of Contents at the top of each article.
The code has not been attributed to any one person but I will gladly cite the author if someone claims to be he or she.