Import credit-fund loans into NAV (eNAV HLD-LOANS schedule)

The eNAV importer read only the HLD securities sheet, so a credit fund's
loan book (its largest asset) never reached NAV. SATS Credit Fund showed
$3.6M of securities while holding a $46.3M loan to Fold Holdings.

Parse the HLD-LOANS schedule alongside HLD: each loan becomes a holding
and position valued at principal plus accrued interest, flowing into
holdings, invested cost, and the quarter NAV. Adds test coverage and
bumps the package to 0.2.47.

deploy/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ten31portal-startos",
-  "version": "0.2.45",
+  "version": "0.2.47",
   "private": true,
   "scripts": {
     "build": "npm run check && rm -rf ./javascript && ncc build startos/index.ts -o ./javascript",