Runtime Lib First

mandatory

Sub-policy de `reuse-first` para libs runtime compartilhadas (Go, JS, Python, Rust, plus libs cross-language como koder_ipc / koder_chat). Herda decision tree, protocolo pré-Write e promotion pipeline da meta; acrescenta apenas as regras categoricamente distintas de runtime libs: SemVer estrito, API stability tiers, paridade multi-linguagem, benchmarks obrigatórios, coverage ≥ 85%, wire compat client-N ↔ server-N-1.

Sub-policy of reuse-first. Inherits the decision tree, the pre-Write protocol and the promotion pipeline. Do not redeclare them here. This file contributes only the rules that are categorically distinct for runtime libraries (libraries imported and executed inside other Koder modules).

Scope

Applies to any code in:

`enginessdkgo

coverage/` and flag deltas > 5% drop.

Cross-references

Meta: policies/reuse-first.kmd.
Sibling categories: ui-framework-first.kmd, build-tooling-first.kmd, protocol-first.kmd.
Adjacent policies: releases.kmd for release pipeline; testing.kmd for test discipline; code-first.kmd for the mechanical-vs-analytical axis.