Prompt Proof Demo Project Support Rag Assistant v 0

# PromptProof — Demo Project: Support & RAG Assistant (v0.1)

> **Purpose:** A compact, realistic LLM application that reliably triggers the failure modes PromptProof is built to catch. You can run it locally, capture fixtures deterministically, and create **red→green** PRs on demand.

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## 0) TL;DR

- Build a tiny service with **two endpoints**: `POST /support/reply` (support assistant) and `POST /rag/answer` (doc Q&A with citations).
- It uses an LLM (via SDK wrapper) for:
  1. **Support Reply**: free‑text answer + required disclaimer; must avoid PII leaks.
  2. **Extractor** (support sidecar): strict JSON with `status`, `items`, and `confidence`.
  3. **RAG Answer**: must include a **Sources:** section with at least one URL; multilingual (EN/FR) tone & refusals.
  4. **Tool call** demo: schedules a calendar event (start\<end) to show arg validation.
- We record **fixtures** for typical inputs/outputs and **replay** them in CI with `promptproof.yaml` contracts.

**Impactful failures we will demo:** PII leakage, schema drift, missing disclaimers, bogus citations, tool-arg errors, cost/latency budget breaches, multilingual regressions.

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## 1) Repo Layout (demo app)