Registry and scanning

Announcement storage backends and scanner behavior

Registry backends

SPECTER provides two registry implementations:

• MemoryRegistry: concurrent in-memory store with view-tag indexing
• FileRegistry: memory-backed store with disk persistence and autosave

Query patterns

• get_by_view_tag(tag) for efficient bucket scans
• get_by_time_range(start, end) for time windows
• get_by_id(id) for point lookup
• count() and next_id() for metadata

Scanner behavior

Scanner supports:

• Full scans (scan_all)
• Filtered scans by time/view tags (scan_with_config)
• Progress callbacks (scan_with_progress)
• Stop-on-first discovery mode

Scanner configuration fields

Field	Description
batch_size	Logical batch control
stop_on_first	Return after first discovery
from_timestamp / to_timestamp	Time range filtering
view_tag_filter	Scan only selected tag buckets

Scanner::from_wallet is currently todo!() and not implemented.