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This removes all external dependencies by embedding the secp256k1-learn
implementation into internal/secp256k1.
Changes:
- Add internal/secp256k1 with field arithmetic, curve ops, keys, schnorr
- Update keys.go to use internal secp256k1 package
- Remove btcec/btcutil dependencies (go.mod is now clean)
- All tests pass
Tradeoffs:
- ~10x slower crypto ops vs btcec (acceptable for nostr use case)
- Not constant-time (documented limitation)
- Zero external dependencies
Refs: code.northwest.io/secp256k1-learn
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