Function build_enriched_task_pack 

pub fn build_enriched_task_pack(
    root: &Path,
    goal: &str,
    files: &[String],
    symbols: &[String],
    budget: Option<usize>,
    hook: bool,
) -> Result<ContextPack>

pack with scorer + beads + hindsight and its post-enrichment token count. NO Surface delta, NO ContextLedger mutation, NO visibility side effects. Pack-only callers (context compress, build_task_pack) MUST use this — NEVER build_task_context, which also builds a delta and records its rendered ids in the ledger: throwing the delta away would mark Surface APIs “already visible” the agent never saw, breaking the ledger invariant (ledger = content actually shown to the agent).