feat: US-187 - Add yaml project-matrix fixture

Author: NathanFlurry

docs/nodejs-compatibility.mdx

@@ -84,6 +84,7 @@ The [project-matrix test suite](https://github.com/rivet-dev/secure-exec/tree/ma
 | [chalk](https://npmjs.com/package/chalk) | Terminal | Terminal string styling, ANSI escape codes |
 | [lodash-es](https://npmjs.com/package/lodash-es) | Utility | Large ESM module resolution at scale |
 | [pino](https://npmjs.com/package/pino) | Logging | Structured JSON logging, child loggers, serializers |
+| [yaml](https://npmjs.com/package/yaml) | Utility | YAML parsing, stringifying, document API |
 | [zod](https://npmjs.com/package/zod) | Validation | Schema definition, parsing, safe parse, transforms |
 | [rivetkit](https://npmjs.com/package/rivetkit) | SDK | Local vendor package resolution |
 | crypto (builtin) | Crypto | `crypto.randomBytes`, `randomUUID`, `getRandomValues` |

packages/secure-exec/tests/projects/yaml-pass/fixture.json

@@ -0,0 +1,4 @@
+{
+	"entry": "src/index.js",
+	"expectation": "pass"
+}

packages/secure-exec/tests/projects/yaml-pass/package.json

@@ -0,0 +1,8 @@
+{
+	"name": "project-matrix-yaml-pass",
+	"private": true,
+	"type": "module",
+	"dependencies": {
+		"yaml": "2.8.0"
+	}
+}

packages/secure-exec/tests/projects/yaml-pass/src/index.js

@@ -0,0 +1,51 @@
+import { parse, stringify, parseDocument } from "yaml";
+
+// Parse a YAML string
+const yamlStr = `
+name: secure-exec
+version: 1.0.0
+features:
+  - sandboxing
+  - isolation
+  - compatibility
+config:
+  timeout: 30
+  retries: 3
+  nested:
+    enabled: true
+    level: 2
+`;
+
+const parsed = parse(yamlStr);
+
+// Stringify a JS object back to YAML
+const obj = {
+	database: {
+		host: "localhost",
+		port: 5432,
+		credentials: {
+			user: "admin",
+			pass: "secret",
+		},
+	},
+	tags: ["prod", "us-east"],
+};
+
+const stringified = stringify(obj);
+
+// Re-parse the stringified output to verify round-trip
+const roundTrip = parse(stringified);
+
+// Parse a document for node-level access
+const doc = parseDocument("key: value\nlist:\n  - a\n  - b");
+const docJSON = doc.toJSON();
+
+const result = {
+	parsed,
+	stringified,
+	roundTrip,
+	roundTripMatch: JSON.stringify(obj) === JSON.stringify(roundTrip),
+	docJSON,
+};
+
+console.log(JSON.stringify(result));