Fix failing CI: OpenAPI lint + 32 pre-existing test failures it was masking

babel.config.js

@@ -0,0 +1,8 @@
+// Only used by Jest, to transform the handful of ESM-only transitive
+// dependencies (@noble/hashes, pulled in by @stellar/stellar-sdk) that Jest's
+// default node_modules-ignoring transform can't load. The app itself runs
+// on plain Node, which resolves these packages natively — see
+// jest.config.js's transformIgnorePatterns comment for details.
+module.exports = {
+  presets: [["@babel/preset-env", { targets: { node: "current" } }]],
+};

jest.config.js

@@ -0,0 +1,22 @@
+// Several of @stellar/stellar-sdk's own dependencies (@noble/hashes,
+// uint8array-extras, ...) publish ESM-only ("type": "module"). Node
+// resolves these fine natively via package.json `exports`, but Jest's
+// default config ignores all of node_modules for transformation, so it
+// hits raw `import`/`export` syntax and fails with "Cannot use import
+// statement outside a module" / "Unexpected token 'export'". Rather than
+// naming each ESM-only package individually (fragile as the SDK's own
+// dependencies change), un-ignore its whole private dependency tree so
+// babel.config.js can transform whichever ones need it.
+module.exports = {
+  // @noble/hashes, @noble/ed25519, and uint8array-extras (transitive
+  // dependencies of @stellar/stellar-sdk, some hoisted to the top level,
+  // some nested under the SDK's own node_modules) are ESM-only. Anchored at
+  // ^ deliberately: some of these live two node_modules/ segments deep
+  // (node_modules/@stellar/stellar-sdk/node_modules/@noble/...), and an
+  // unanchored lookahead gets re-tried starting from the *second*
+  // node_modules/ occurrence too, which defeats it. Anchoring makes the
+  // lookahead scan the whole path exactly once.
+  transformIgnorePatterns: [
+    "^(?!.*(@noble|uint8array-extras)).*node_modules.*",
+  ],
+};

openapi.yaml

@@ -1700,7 +1700,8 @@ components:
           $ref: "#/components/schemas/StellarAddress"
         total_amount:
           type: number
-          exclusiveMinimum: 0
+          minimum: 0
+          exclusiveMinimum: true
           description: Total airdrop amount in asset units
           example: 10000
         expiry_ledger:
@@ -1752,7 +1753,8 @@ components:
           $ref: "#/components/schemas/StellarAddress"
         amount:
           type: number
-          exclusiveMinimum: 0
+          minimum: 0
+          exclusiveMinimum: true
           description: Amount in asset units (at most 7 decimal places)
           example: 100.5
       required:
@@ -1824,7 +1826,8 @@ components:
           description: Alert trigger condition
         threshold_usd:
           type: number
-          exclusiveMinimum: 0
+          minimum: 0
+          exclusiveMinimum: true
           description: Price threshold in USD (or percentage for change_pct)
           example: 0.5
         webhook_url: