feat: add refund intake schema selection examples

[rlippmann]

Summary

Adds generic refund-intake schema-selection examples for Python and TypeScript.

Both examples show a host application selecting a refund-intake workflow/schema from Context Compiler authoritative state, without relying on an LLM, prompt text, or model output.

Why

This fills the generic schema-selection enforcement-point example.

The examples demonstrate that schema selection is controlled by explicit compiler state: use refund_intake authorizes the refund workflow, while refund-like or adversarial request text alone does not select it.

Example metadata

• Enforcement point: schema selection
• Domain: refund intake / customer support routing
• Technology/runtime: Python runtime and TypeScript runtime
• Example type: minimal example
• Does this use directive drafter? should normally be no: no
• Does this derive state from model output? must be no for primary examples: no

Checklist

• Repository scaffolding / governance change
• One primary enforcement point
• Explicit authoritative state
• No model-derived state mutation
• Adversarial stub or equivalent test
• Observable runtime behavior change
• Domain vocabulary is natural
• Framework is secondary to the enforcement point
• Docs updated
• Tests/smoke checks added where practical

Notes

Validation run:

• uv run pytest python/tests/test_refund_intake_example.py
• npm test from typescript/examples/schema_selection/refund_intake