fix: update constants and faucet URL for v0.2.1

- ACCOUNT_CREATION_UNITS: 100 → 500 (matches chain's 5 Z fee)
- TX_SIZE: 100 → 136 (full 64-byte Ed25519 signature)
- TESTNET_FAUCET: raw IP → https://rpc.zzero.net (HTTPS proxy)
- Bumped to v0.2.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: TEB1157

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "zero-network"
-version = "0.2.0"
+version = "0.2.1"
 description = "Python SDK for the Zero Network — stablecoin microtransactions for AI agents"
 readme = "README.md"
 license = "MIT"

zero_network/__init__.py

@@ -40,7 +40,7 @@
 from .transaction import Transfer, build_transfer, parse_transfer, sign_transfer
 from .wallet import Wallet
 
-__version__ = "0.2.0"
+__version__ = "0.2.1"
 
 __all__ = [
     # Core

zero_network/constants.py

@@ -12,14 +12,14 @@
 # Maximum transfer: 25 Z = 2500 units
 MAX_TRANSFER_UNITS: int = 2500
 
-# Account creation cost: 1.00 Z = 100 units (deducted on first receive)
-ACCOUNT_CREATION_UNITS: int = 100
+# Account creation cost: 5.00 Z = 500 units (deducted on first receive)
+ACCOUNT_CREATION_UNITS: int = 500
 
-# Transaction size in bytes: from[32] + to[32] + amount[4] + nonce[4] + signature[28]
-TX_SIZE: int = 100
+# Transaction size in bytes: from[32] + to[32] + amount[4] + nonce[4] + signature[64]
+TX_SIZE: int = 136
 
 # Default RPC endpoint
 DEFAULT_RPC: str = "https://rpc.zzero.net"
 
 # Testnet faucet endpoint
-TESTNET_FAUCET: str = "http://157.180.56.48:8093"
+TESTNET_FAUCET: str = "https://rpc.zzero.net"