feat: Export endowment factories via sub-path

Add `@metamask/snaps-execution-environments/endowments` sub-path export
that exposes generic endowment factory modules (timeout, interval, date,
textEncoder, textDecoder, crypto, math) for reuse in other SES-based
projects like ocap-kernel.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sirtimid

packages/snaps-execution-environments/CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Export endowment factories via `@metamask/snaps-execution-environments/endowments` sub-path ([#XXXX](https://github.com/MetaMask/snaps/pull/XXXX))
+  - Exports endowment factory modules: `timeout`, `interval`, `date`, `textEncoder`, `textDecoder`, `crypto`, `math`
+
 ## [11.0.2]
 
 ### Changed

packages/snaps-execution-environments/package.json

@@ -28,6 +28,16 @@
         "default": "./dist/index.cjs"
       }
     },
+    "./endowments": {
+      "import": {
+        "types": "./dist/endowments.d.mts",
+        "default": "./dist/endowments.mjs"
+      },
+      "require": {
+        "types": "./dist/endowments.d.cts",
+        "default": "./dist/endowments.cjs"
+      }
+    },
     "./node-process": "./dist/webpack/node-process/bundle.js",
     "./node-thread": "./dist/webpack/node-thread/bundle.js",
     "./package.json": "./package.json"

packages/snaps-execution-environments/src/endowments.ts

@@ -0,0 +1,29 @@
+/**
+ * Public endowment factory exports for use outside the Snaps ecosystem.
+ *
+ * Each module provides a `names` array and a `factory` function. Call
+ * `factory()` to obtain hardened endowment values (and an optional
+ * `teardownFunction` for timer-based endowments).
+ *
+ * @example
+ * ```ts
+ * import { timeout, date } from '@metamask/snaps-execution-environments/endowments';
+ *
+ * const timers = timeout.factory();
+ * // { setTimeout, clearTimeout, teardownFunction }
+ *
+ * const dateEndowment = date.factory();
+ * // { Date } (with noise-added Date.now)
+ * ```
+ *
+ * @module endowments
+ */
+
+// Individual endowment factory modules
+export { default as timeout } from './common/endowments/timeout';
+export { default as interval } from './common/endowments/interval';
+export { default as date } from './common/endowments/date';
+export { default as textEncoder } from './common/endowments/textEncoder';
+export { default as textDecoder } from './common/endowments/textDecoder';
+export { default as crypto } from './common/endowments/crypto';
+export { default as math } from './common/endowments/math';