v0.5.0

• Rename the standalone direct-message archive model to notification collections: file reference and notification mail with 'afmail notification create/add' under stable nYYYYMMDDNNN uids and read it via 'afmail notification list/show', leaving the archive command to mean archived cases only
• Require an explicit case category on 'afmail case create --group' with no default and no 'open' catch-all, and nest archived cases under archive/cases// so the category survives archival
• Block attachment fetches on spam-classified messages so an agent cannot be lured into pulling hostile payloads from mail it already flagged as spam
• Queue remote trash for every mailbox a case's messages occupy, including Sent, so already-sent replies move to trash with the rest of the conversation when a case is discarded
• Surface a structured audit_warnings entry when a confirmed push effect's audit record cannot be written, instead of silently dropping the lost record
• Add index.md read views to the spam, trash, and deleted folders, and change the notification message-index default fields from sender to from
• Make identity config setup idempotent, fix push incremental refresh, fix restore push cleanup and reply recipients, surface the contact command in CLI error hints, and upgrade dependencies