Function is_eligible 

pub fn is_eligible(
    state: &WorkItemState,
    min_age_days: u32,
    now_us: i64,
) -> bool

Check if a work item is eligible for compaction.

An item is eligible if:

• Its lifecycle state is Done or Archived
• It has been in that terminal state for at least min_age_days
• It is not soft-deleted (deleted items are already lightweight)

Arguments

• state — The current CRDT state of the item.
• min_age_days — Minimum days in done/archived before compaction.
• now_us — Current wall-clock time in microseconds.