Sending and Receiving silent payment transactions with bdk-sp
summary
Demonstrates sending and receiving silent payments with the bdk-sp experimental repo, using ECDH shared secrets from BIP-352 to derive per-output pubkeys and an input_hash to avoid address reuse. Introduces separate scanner and spending keys (Bcan and Bspend) so a scanning service can detect payments without holding spend keys, but scanning forces an ECDH per candidate output so light clients face heavy CPU or must use a remote fate scanner. Live regtest demo mines a block and the bdk-sp wallet shows 10,000 sats received.
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