chore(deps): bump @letta-ai/letta-client from 1.7.7 to 1.7.8 (#186)

Bumps [@letta-ai/letta-client](https://github.com/letta-ai/letta-node) from 1.7.7 to 1.7.8.
- [Release notes](https://github.com/letta-ai/letta-node/releases)
- [Changelog](https://github.com/letta-ai/letta-node/blob/main/CHANGELOG.md)
- [Commits](https://github.com/letta-ai/letta-node/compare/v1.7.7...v1.7.8)

---
updated-dependencies:
- dependency-name: "@letta-ai/letta-client"
  dependency-version: 1.7.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package-lock.json

@@ -11,7 +11,7 @@
       "dependencies": {
         "@clack/prompts": "^0.11.0",
         "@hapi/boom": "^10.0.1",
-        "@letta-ai/letta-client": "^1.7.7",
+        "@letta-ai/letta-client": "^1.7.8",
         "@letta-ai/letta-code-sdk": "^0.0.5",
         "@types/express": "^5.0.6",
         "@types/node": "^25.0.10",
@@ -1272,9 +1272,9 @@
       "license": "MIT"
     },
     "node_modules/@letta-ai/letta-client": {
-      "version": "1.7.7",
-      "resolved": "https://registry.npmjs.org/@letta-ai/letta-client/-/letta-client-1.7.7.tgz",
-      "integrity": "sha512-jPq/hpctvN7DGnOg+1yRWAMdPhWeVxh89qOhQMzhO55q6/ai/yXHJ0hoXiPbQOZWHb2kO+WwjsLROVkb5Hj8ow==",
+      "version": "1.7.8",
+      "resolved": "https://registry.npmjs.org/@letta-ai/letta-client/-/letta-client-1.7.8.tgz",
+      "integrity": "sha512-l7BGsAZOI8b+H1RO2IMzMv3P0VXj6Of2wXLCg5LZejOk0dHLLBi2me4WspLg+6zWPGIRJwMRsxmfp4kV9Zzh6g==",
       "license": "Apache-2.0"
     },
     "node_modules/@letta-ai/letta-code": {