#:schema ../../../schema/clause.schema.json

[govctl]
id = "C-BS1-COMPATIBILITY"
title = "Batch-size one compatibility"
kind = "normative"
status = "active"
since = "0.1.0"

[content]
text = """
Batch-size one CP shared-KV allocation MUST continue to satisfy the existing owner-lane allocation contract.

A batch-size one request processed through the batch-aware allocation path MUST produce the same owner sequence as the existing single-request in-sequence owner planner for the same prefix length, extend length, page size, and CP size.

The system SHOULD share owner-lane allocation logic between batch-size one and batch-size greater than one to avoid long-lived divergent behavior.

**Rationale:** W2 is an extension of the current owner-lane allocation path, not a replacement with different semantics for existing single-request prefill."""