[Anthropic Go SDK self-hosted environments] Memory store mount fails: 'something already exists at the memory store's path' / 'the worker host must make this mount path writable'

Cause (Documented platform behavior): The worker refuses pre-existing roots (a dead run's leftovers would be uploaded into the store on first sync) and requires a writable clean absolute mount path. Fix status: documented_behavior Other error fragments: - it must not exist when the session starts - cannot create the memory store's folder: - the worker host must make this mount path writable - mount_path is not a clean absolute path: Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/anthropics/anthropic-sdk-go/3cfb2242c7adaa0dc3b8c2ad1972d9b47d820765/lib/environments/memories.go (official_docs, unknown, documented_behavior): storeRoot validates mount_path; attach refuses existing roots and reports non-writable roots with these messages; comment explains leftover upload risk. Search phrasings: anthropic memory store path already exists session starts; self-hosted worker memory store mount path writable Evidence basis (self-declared by the contributing chat client): public_source.