feat(sdk): RustChain Python SDK v3 -- pip install rustchain (Bounty #2297, 125 RTC)

[kuanglaodi2-sudo]

Summary

Implements a comprehensive Python SDK for RustChain (Bounty #2419 / #2297, 125 RTC).

What

• rustchain/ package with full async httpx client, dataclass models, typed exceptions
• CLI with 7 subcommands: health, epoch, miners, balance, transfer-signed, admin-transfer, settle
• 15+ pytest unit tests with mocked responses
• pyproject.toml with pip install rustchain support and entry point

Files

File	Description
rustchain/__init__.py	Package init, exports
rustchain/client.py	Async RustChainClient with context manager
rustchain/models.py	NodeHealth, EpochInfo, MinerInfo, BalanceInfo, SignedTransfer
rustchain/exceptions.py	RustChainError, APIError, ValidationError, AuthenticationError
rustchain/cli.py	CLI with argparse subcommands
tests/test_client.py	15 pytest tests with mocked httpx
pyproject.toml	Package metadata, entry point
README.md	Full SDK documentation

API Coverage

• GET /health → NodeHealth
• GET /epoch → EpochInfo
• GET /api/miners → list[MinerInfo]
• GET /wallet/balance?miner_id= → BalanceInfo
• POST /wallet/transfer/signed → signed transfer
• POST /wallet/transfer (X-Admin-Key) → admin transfer
• POST /rewards/settle (X-Admin-Key) → settle rewards

Bounty Payout

Wallet: C4c7r9WPsnEe6CUfegMU9M7ReHD1pWg8qeSfTBoRcLbg

---

Bounty #2419 — 125 RTC

[github-actions]

Welcome to RustChain! Thanks for your first pull request.

Before we review, please make sure:

• Your PR has a BCOS-L1 or BCOS-L2 label
• New code files include an SPDX license header
• You've tested your changes against the live node

Bounty tiers: Micro (1-10 RTC) | Standard (20-50) | Major (75-100) | Critical (100-150)

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