microsoft: parse Graph spec with the lean OpenAPI parser to fit the Workers isolate

The full Graph OpenAPI document (37MB, ~16.5k operations) parsed through the
bespoke eemeli/yaml `YAML.parse` builds a full CST that peaks ~720MB heap and
OOMs the 128MB Cloudflare Workers isolate (measured on a real isolate: HTTP
503, outcome=exceededMemory).

Delegate the parse to the OpenAPI SDK's `parse`, which uses js-yaml's `load`
and does not inline `$ref`s. It peaks ~315MB heap and returns HTTP 200 in-band
on the same isolate. `parse` already validates an OpenAPI 3.x object, so the
redundant object/version checks are dropped. `YAML.stringify` is retained for
emitting the small filtered preset spec, which never touches the 37MB document.

Author: RhysSullivan

packages/plugins/microsoft/src/sdk/graph.ts

@@ -7,6 +7,7 @@ import { AuthTemplateSlug } from "@executor-js/sdk/core";
 import {
   AuthenticationSchema,
   OpenApiParseError,
+  parse as parseOpenApiDocument,
   type Authentication,
   type OpenApiIntegrationConfig,
   type ParsedDocument,
@@ -538,26 +539,21 @@ export const fetchMicrosoftGraphPermissionsReference = Effect.fn(
 const parseMicrosoftGraphOpenApiDocument = (
   specText: string,
 ): Effect.Effect<MicrosoftGraphOpenApiDocument, OpenApiParseError> =>
-  Effect.gen(function* () {
-    const parsed = yield* Effect.try({
-      try: () => YAML.parse(specText) as unknown,
-      catch: () =>
+  // Delegate to the OpenAPI SDK's lean js-yaml parser. The bespoke eemeli/yaml
+  // `YAML.parse` this replaced built a full CST that peaks ~720MB heap on the
+  // 37MB Graph spec and OOMs the 128MB Cloudflare Workers isolate (measured:
+  // HTTP 503, outcome=exceededMemory). The SDK parser peaks ~315MB and runs
+  // in-band on Workers. `parse` already validates an OpenAPI 3.x object and
+  // does not inline `$ref`s, so peak memory stays bounded for big specs.
+  parseOpenApiDocument(specText).pipe(
+    Effect.mapError(
+      () =>
         new OpenApiParseError({
           message: "Failed to parse Microsoft Graph OpenAPI document",
         }),
-    });
-    if (!isRecord(parsed)) {
-      return yield* new OpenApiParseError({
-        message: "Microsoft Graph OpenAPI document must be an object",
-      });
-    }
-    if (typeof parsed.openapi !== "string" || !parsed.openapi.startsWith("3.")) {
-      return yield* new OpenApiParseError({
-        message: "Microsoft Graph OpenAPI document must be OpenAPI 3.x",
-      });
-    }
-    return parsed as MicrosoftGraphOpenApiDocument;
-  });
+    ),
+    Effect.map((doc) => doc as MicrosoftGraphOpenApiDocument),
+  );
 
 export const buildFilteredMicrosoftGraphOpenApiSpecFromDocument = (
   parsed: MicrosoftGraphOpenApiDocument,