feat: a grounded resource ends with the references it drew on

The grounding metadata went to the API response and the logs, which is no use to
someone holding the deck. A teaching resource shown to trainees should carry its
own provenance, so a grounded one now ends with a References section — the final
slide in a presentation — listing the library excerpts it actually used, by
title and page.

Restricted deliberately: only excerpts actually drawn on, nothing invented. That
was worth checking rather than trusting. Generated a deck and compared every
citation against the source metadata: "Kliegman R. Nelson Textbook of
Pediatrics, 22nd ed., 2024, p. 2604" against a stored title of "Kliegman R.
Nelson Textbook of Pediatrics 2-Volume Set 22ed 2024" at page 2604, and the same
for Fleisher & Ludwig, Rosen's, Understanding Pathophysiology and the AAP
compendium. The model reformatted filename-derived titles into readable
citations using only what it was given.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dv6sqaY6Vq3ChZHMem3cnU

src/routes/learningAI.js

@@ -152,6 +152,9 @@ function buildGeneratePrompt(opts) {
     source += '\nThe following excerpts come from this institution\'s indexed clinical library. ' +
       'Prefer them over your own recall wherever they disagree, and do not contradict them. ' +
       'They are reference material, not a template: write the resource in your own words.\n\n' +
+      'End the resource with a short References section listing only the excerpts you actually ' +
+      'drew on, by title and page. In a presentation this is the final slide, titled References. ' +
+      'Do not invent references, and do not list an excerpt you did not use.\n\n' +
       'LIBRARY EXCERPTS:\n"""\n' + corpusContext + '\n"""\n';
   }
 

test/learning-retrieval.test.js

@@ -111,6 +111,10 @@ test('the corpus block tells the model to prefer it over recall', () => {
   const route = read('src/routes/learningAI.js');
   assert.match(route, /Prefer them over your own recall wherever they disagree/);
   assert.match(route, /reference material, not a template/, 'so it writes rather than copies');
+  // Provenance a clinician can check, on the deck itself rather than only in a
+  // log. Restricted to excerpts actually used, and explicitly not invented.
+  assert.match(route, /In a presentation this is the final slide, titled References/);
+  assert.match(route, /Do not invent references, and do not list an excerpt you did not use/);
   // Opt in: a resource on something the library does not cover is better
   // written without it than padded with the nearest unrelated excerpts.
   assert.match(route, /var useCorpus\s+= String\(req\.body\.useCorpus\) === 'true'/);