host: Phase 3 — strangler migration ledger + coverage, 107/107

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/host/conformance.sh

@@ -59,6 +59,7 @@ MODULES=(
   "lib/host/sxtp.sx"
   "lib/host/router.sx"
   "lib/host/feed.sx"
+  "lib/host/ledger.sx"
 )
 
 # Suites: NAME RUNNER-FN PATH
@@ -68,6 +69,7 @@ SUITES=(
   "sxtp        host-sx-tests-run!  lib/host/tests/sxtp.sx"
   "router      host-rt-tests-run!  lib/host/tests/router.sx"
   "feed        host-fd-tests-run!  lib/host/tests/feed.sx"
+  "ledger      host-lg-tests-run!  lib/host/tests/ledger.sx"
 )
 
 TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT