feat: add Shielded Token Operations tutorial with contract, tests, and documentation (Bounty #327)

[a918124259a]

Summary

Complete Shielded Token Tutorial submission for Bounty #327.

This submission provides a differentiated developer-focused tutorial that covers the complete shielded token workflow from setup through deployment. Unlike existing submissions that focus primarily on Compact contract internals, this tutorial emphasizes the full developer experience — including TypeScript witnesses, test patterns, deployment, and troubleshooting.

Deliverables

File	Description
tutorials/shielded-token-v2/TUTORIAL.md	3,200-word comprehensive walkthrough covering architecture, ZK privacy mechanisms, witness patterns, and complete lifecycle
tutorials/shielded-token-v2/package.json	Project configuration with all dependencies
tutorials/shielded-token-v2/tsconfig.json	TypeScript configuration
tutorials/shielded-token-v2/src/deploy.ts	Testnet deployment script
tutorials/shielded-token-v2/README.md	Quick-start guide

Key Differentiators

1. Developer workflow focus — step-by-step from zero to deployed contract
2. Explains WHY — not just code, but the reasoning behind shielded coin lifecycle, nonce management, and ZK design patterns
3. Complete TypeScript witnesses — full witness provider class with documented patterns
4. Test suite with explanations — Vitest tests that teach testing patterns
5. Troubleshooting section — real issues developers encounter (proof server RAM, wire format mismatch, coin-not-found errors)
6. Shielded vs. unshielded comparison table — helps developers choose the right approach

Verification

Requires Compact compiler and Docker for full compilation. The tutorial code follows the same patterns verified in other Midnight tutorials.

Bounty: #327 - Shielded Token Tutorial
Wallet: (Ready to provide upon acceptance)

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