- Android.bp: sdk_version is empty (platform APIs) but platform_apis
wasn't set, which Soong doesn't just reject cleanly -- it panics.
- PawletCacheService.kt was missing the pawletos.cache.IPawletCacheService
import (different package than the file's own os.pawlet.cache).
- CacheToken.isExpired called CacheTokenVerifier's private parseIso8601,
invisible outside that object; moved it to file scope so both can use it.