Exclude dispatcher pages from curriculum quality index (#1721)

* Initial plan

* feat: exclude dispatcher pages from curriculum quality index

- Add <!-- learning:false --> to workshop/01-prerequisites.md
- Pass learning_only=True to sorted_workshop_files() in curriculum-evaluator.md
- Recompile curriculum-evaluator.lock.yml

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot

.github/workflows/curriculum-evaluator.lock.yml

@@ -41,7 +41,7 @@ steps:
       sys.path.insert(0, str(pathlib.Path('.github/skills/curriculum-quantitative-assessment').resolve()))
       from curriculum_assessment import score_workshop_file, sorted_workshop_files
 
-      entries = [score_workshop_file(path) for path in sorted_workshop_files('workshop')]
+      entries = [score_workshop_file(path) for path in sorted_workshop_files('workshop', learning_only=True)]
 
       pathlib.Path('/tmp/gh-aw/data/corpus-metrics.json').write_text(
           json.dumps({'files': entries, 'total': len(entries)}, indent=2)

.github/workflows/curriculum-evaluator.md

@@ -1,5 +1,6 @@
 <!-- page-journey: all -->
 <!-- page-adventure: core -->
+<!-- learning:false -->
 
 # Before we start