Function compact_item 

pub fn compact_item<S: BuildHasher>(
    item_id: &str,
    events: &[Event],
    agent: &str,
    redacted_hashes: &HashSet<String, S>,
) -> Option<Event>

Compact all events for a single item into one item.snapshot event.

Replays events to produce final CRDT state, then creates a single snapshot event encoding the full WorkItemState with per-field clocks.

Arguments

• item_id — The work item identifier.
• events — All events for this item, in causal/chronological order.
• agent — Agent identifier for the snapshot event.
• redacted_hashes — Set of event hashes that have been redacted. If any source events are redacted, the compaction is skipped (returns None).

Returns

Some(Event) with the snapshot, or None if the item has redacted events (compaction must not reintroduce redacted content).

Panics

Panics if the SnapshotPayload cannot be serialized to JSON. This should never happen with valid CRDT state.