docs: add all missing pages to mkdocs nav and fix absolute link

- Add 32 pages to nav: architecture (9), modules (1), migrations (1),
  testing (3), proposals (8), archive (11)
- Fix absolute link in jinja-macros.md that mkdocs couldn't validate
- Exclude mkdocs.yml from check-yaml hook (uses !!python/name tags)
- Result: mkdocs build with zero warnings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/frontend/shared/jinja-macros.md

@@ -1045,7 +1045,7 @@ For complex detail views (job details, log entries, etc.), use inline modals wit
 </div>
 ```
 
-See the [Components Library](/admin/components#modals) for live examples.
+See the Components Library (Admin > Components > Modals) for live examples.
 
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