Cross-calling in scripts

A .svelte file may have several <script lang="ts"> and <script lang="d"> tags. Each export is registered even if the other language never calls it. Same-file D uses the simple name. Another file imports the printed thunk (import lib.Bridge : greet). Registry keys are module-mangled (lib_Bridge_svelte.greet) so two components can share a name.

Arguments are not arity-strict: omit a trailing parameter and the callee default stays. Async TS functions return JsPromise so D uses .await the same way as {#await}.

The full calling convention — Lodash callTs, exportDelegate / callNative, imports — is Cross-calling lang=d and lang=ts.