Every test passes the typecheck gate

tsconfig.test.json existed precisely so a test that does not compile cannot silently be a
test that never ran — and four beds did not compile: two returned strings from test bodies,
two predate GenesisOptions gaining sdkSource, one passed a nullable host binary. All clean;
the gate is now part of launching any bed.

https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx

test/integration/fresh-mesh.test.ts

@@ -330,6 +330,7 @@ before(async () => {
         source,
         sourceRef,
         toolsSource: forgeUrl(BASE.repo),
+        sdkSource: forgeUrl("mesh-sdk"),
         catalogSource: forgeUrl(MODULE.repo),
         catalogRef: refFor(MODULE.repo),
         log: (m) => console.log(m),