fix: remove restore-keys from Android expo prebuild cache

restore-keys was restoring stale cache entries on partial key match,
leaving an outdated android/ directory. expo prebuild running on top of
it did not fully regenerate MainApplication.kt, causing ReactNativeHostWrapper
build errors. Without restore-keys, a cache miss means no android/ dir
and expo prebuild always generates a clean native project.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: msluszniak

.github/workflows/build-android-llm-example.yml

@@ -57,8 +57,6 @@ jobs:
         with:
           path: ${{ env.WORKING_DIRECTORY }}/android
           key: ${{ runner.os }}-expo-android-${{ hashFiles('apps/llm/app.json', 'apps/llm/package.json') }}
-          restore-keys: |
-            ${{ runner.os }}-expo-android-
       - name: Generate native Android project
         working-directory: ${{ env.WORKING_DIRECTORY }}
         run: |