Show HN: Verifiable server roundtrip demo for a decision interruption system

This is a read-only demonstration repo showing a full server-side decision interruption roundtrip:

REQUIRE_CONFIRM → EXECUTE → REJECT

The demo is intentionally minimal and static. It exists only to make one thing verifiable:

how a high-risk decision is interrupted,

how a receipt + plan_hash are issued,

and how execution is either explicitly confirmed or rejected.

The repository includes:

a runnable CLI-style roundtrip (demo_server_roundtrip.ts)

frozen evidence artifacts (_evidence/*.json)

a CI check that validates the outputs deterministically

There is no UI, no SaaS, and no agent behavior here. This is not a product — it’s an evidence artifact meant for engineers who want to inspect the mechanics.

Feedback from people who’ve built guardrails, code review tools, or AI-assisted workflows is especially welcome.