Function select_lifecycle_candidates 

pub fn select_lifecycle_candidates(
    project: Option<&MatchedProject>,
    records: &[(String, MemoryRecord)],
    input: &RouteInput,
    limit: usize,
    excluded_record_ids: &HashSet<String>,
    reference_map: Option<&ReferenceMap>,
) -> Vec<LifecycleCandidate>

从 lifecycle ledger 的 (record_id, record) 列表里打分 + 过滤 + 截断，产出 top-N lifecycle 候选。

excluded_record_ids 用于去重:已经被 canonical vault note 覆盖的 record_id 不再作为 lifecycle candidate 返回,避免同一条记忆在 context 里双计(note 一次 + lifecycle candidate 一次)。

reference_map 提供 staleness 信息，传 None 跳过 staleness 惩罚。

After initial top-K selection, performs 1-hop relation expansion via related_records fields. Expanded candidates receive a 30% score penalty and are merged into the result before final truncation. Records that didn’t score on their own but are referenced by a top-K record receive a base score derived from the referencing record’s score.