Add durable buyer-bound Lightning recovery and explicit native retry

Preserve original invoice preimages, private snapshots and exposure provenance; serialize rail admission and retire native-only failures before explicit replacement. Qualify 55 focused UI tests and vue-tsc. Expanded 17 engine cases and combined backend acceptance remain pending; six earlier engine cases passed in isolation. No live payment or publication.

core/archipelago/src/main.rs

@@ -44,6 +44,8 @@ mod content_auth;
 mod content_hash;
 mod content_indeehub;
 mod content_invoice;
+mod content_lightning;
+mod content_payment_admission;
 mod content_owned;
 mod content_purchase;
 mod content_purchase_executor;