Function block_step_cost

crates/kernel/src/shard.rs:1643–1650

Predicted Zisk guest STEPS contributed by a single block (reduction + its own ingress). The per-shard floor and any cross-shard re-ingress are added at the shard level, not here.

(b: &BlockEntry)

    manifest.summary(),
    prove_report(&profile, &plan.shard_of, &manifest, parallelism),
    plan.max_shard_steps,
    max_cycles,
    SHARD_COST_FLOOR,
    plan.largest_block_steps,
    note,
  ))
}

/// Calibrated Zisk guest-COST model — the **single source of truth** for
/// predicting a block's in-circuit cost contribution, in **ziskemu cost
/// units** (`ziskemu -X` TOTAL: MAIN + OPCODES + MEMORY + PRECOMPILES +