feat: establish TypeScript-aware frontend tooling

tests/runtime-schema/http-schema.test.js

@@ -31,6 +31,7 @@ describe("HTTP runtime schema boundary", () => {
       success: true,
       data: [{ id: "resource-1", additive: "accepted" }],
     });
+    if (!result.success) throw new Error("expected valid sample payload");
     expect(result.data).not.toBe(source);
   });
 

tests/runtime-schema/runtime-config.test.js

@@ -25,7 +25,8 @@ describe("runtime configuration boundary", () => {
     [{ ...validConfig, TELEMETRY_ENABLED: "false" }, "ambiguous boolean"],
     [{ ...validConfig, CONFIG_SCHEMA_VERSION: "next" }, "version"],
     [{ ...validConfig, UNKNOWN_KEY: true }, "unknown key"],
-  ])("rejects invalid config: %s (%s)", (candidate) => {
+  ])("rejects invalid config: %s (%s)", (candidate, _reason) => {
+    void _reason;
     expect(validateRuntimeConfig(candidate).success).toBe(false);
   });