Why:
- Large downloaded batches can outlive the finite remote operation and be suspended before every document reaches the Vault.
- The v1.0 activity contract requires local application to remain distinct from remote-operation reporting.
Changes:
- Add an Obsidian-owned local application activity boundary which reuses Wake Lock policy without incrementing remote activity.
- Retain one boundary through queue processing and the final recovery snapshot, releasing and reacquiring it around suspension.
- Log final snapshot failures, preserve processing results, and cover the lifecycle with focused tests and documentation.