Initial Mintlayer Rust SDK

CHANGELOG.md

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+# Changelog
+
+All notable changes to the Mintlayer Rust SDK are documented here.
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+## [0.1.0] - 2026-09-17
+
+### Added
+
+- `node` sub-client: JSON-RPC 2.0 client for the node daemon with the full
+  chainstate, mempool, node and P2P surface (including
+  `p2p_submit_transaction` broadcast).
+- `indexer` sub-client: REST client for api-web-server covering chain,
+  block, transaction, address, pool, delegation, token, NFT, order and
+  statistics endpoints.
+- `wallet` sub-client: JSON-RPC 2.0 client for the wallet daemon covering
+  management, transactions, staking, tokens and DEX orders.
+- `crypto` module: native cryptography and transaction building backed by
+  mintlayer-core — BIP39/BIP32 key derivation, addresses, timelocks, fees,
+  id derivation, all input/output constructors, stake pool data, witness
+  production (standard, HTLC spend/refund single-sig and multisig),
+  partially signed transactions, size estimation, HTLC secret extraction
+  and signed transaction intents.
+- Umbrella `Client` with a builder that wires the remote sub-clients
+  together and a `prelude` of shared type re-exports.
+- Examples: `send-coins` (native signing flow) and `issue-token` (wallet
+  daemon flow).
+- Wire-format integration tests for every sub-client, and consensus-vector
+  tests for the crypto module (BIP39 legacy derivations, transaction ids,
+  fees, timelocks).
+
+### Security
+
+- Basic-auth credentials and mnemonics/passphrases are redacted from `Debug`
+  output across all client and builder types.
+- Daemon response bodies are capped at 64 MiB; HTTP error bodies are
+  additionally truncated and stripped of control characters.
+- JSON-RPC responses must echo the request id.
+- Indexer path segments are validated against a safe charset before being
+  interpolated into request paths.
+- The BIP39 seed and passphrase are zeroized on drop.