Tutorial: Shielded Token Operations: Mint, Transfer & Burn with Test Suite (#327)

[a918124259a]

Summary

Walk through the complete shielded token lifecycle in Compact: minting, transferring,
and burning, with compilable code and a full test suite.

What's Covered

• mintShieldedToken + evolveNonce
• sendShielded + ShieldedSendResult + change notes
• Burning via sendImmediateShielded to shieldedBurnAddress()
• Merkle tree root constraint and why it matters
• mint_and_send atomic pattern
• Full test suite

Closes #327

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