Update the Pragma oracle tutorial for the v14 oracle redeployment

[Keinberger]

Background

Pragma redeployed their Miden oracle for the v14 protocol (astraly-labs/pragma-miden), which changed both the deployment addresses and the consumer-facing interface. The tutorials repo's v14 migration (#186) only updated the SDK API surface of the "Consuming On-Chain Price Data from the Pragma Oracle" Rust tutorial — it still targets Pragma's pre-v14 deployment.

Problem

The Rust oracle tutorial fails at runtime against the current testnet:

1. The hardcoded oracle account ID and get_median procedure root reference Pragma's pre-v14 deployment, which is no longer live.
2. The v14 oracle changed its consumer interface — the trading pair is now a faucet-ID pair, publishers are registered in a storage map instead of value slots, and get_median returns [is_tracked, median_price, amount].

Proposed Solution

Update the tutorial — the MASM contract, the Rust client code, and the embedded snippets in the docs — for Pragma's v14 oracle: the new oracle address and get_median procedure root, the v14 foreign-procedure-invocation ABI, map-based publisher discovery, and faucet-pair-keyed storage proofs. Verify end-to-end against the live v14 testnet oracle.

Any thoughts on this are highly appreciated!