fix: restore missing live-site page imagery

- recover and self-host HubSpot-injected page hero assets
- map source heroes to page and library layouts
- restore the consultation form background
- add page imagery auditing
- update asset inventory and migration documentation

www/package.json

@@ -14,6 +14,7 @@
     "extract:full": "node tools/extract-site.mjs",
     "crawl:live": "node tools/crawl-live-site.mjs",
     "audit:links": "node tools/audit-links.mjs",
+    "audit:images": "node tools/audit-page-imagery.mjs",
     "generate:sitemap": "node tools/generate-sitemap.mjs",
     "generate:redirects": "node tools/generate-redirects.mjs"
   },