Add spool retention and inspection policies #8
Description
Summary
Introduce retention and management capabilities for stored messages under ./data/spool.
Motivation
Messages persist indefinitely and can accumulate without bounds. Providing configurable retention windows, size limits, or basic management APIs/tools will prevent unbounded growth and simplify reviewing stored artefacts.
Proposed direction
- Expose env vars or config files for retention duration, maximum total size, or per-recipient limits.
- Optionally add inspection or cleanup tooling (CLI or API) to list and purge stored messages.
- Ensure changes integrate cleanly with existing storage hashing and permissions.
Labels
- feature
- storage