Harness V2 Rules

Treat harness behavior as an explicit contract with deterministic fixtures and meaningful failures.

Related Review Sources

• DEVINFRA001B-CODEX-HANDOFF-MD-DEVINFRA001B-CODEX-HANDOFF: REVIEWS/DEVINFRA001B_CODEX_HANDOFF.md

Board Rule

Preserve the lesson as a future implementation constraint, not as a raw review transcript.