Add Nix dev shell with pinned test binaries#34
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Introduce a reproducible development environment so the project builds and tests the same way on any machine. The flake provides the pinned Rust toolchain, nightly rustfmt, and the bitcoind/electrs binaries the integration tests need; .envrc loads it via direnv and the justfile wraps the common check/fmt/test commands to mirror CI's gates. bitcoind is pinned to 27.1 from an older nixpkgs rev because the tests' bundled corepc-node only decodes the 27.x getblockchaininfo RPC schema; the current 25.11 channel ships 30.0 and fails decoding. For electrs we package the exact prebuilt esplora binary CI downloads and patch it for NixOS rather than using nixpkgs' blockstream-electrs. The nixpkgs build is much newer and its initial regtest indexing takes around 80 seconds, which overruns the tests' chain sync timeout and makes every integration test fail locally. Building that old revision from source under the current toolchain is fragile, so reusing the same binary CI runs is the cheapest way to match its behaviour. The prebuilt only exists for x86_64 linux and macOS, the two platforms the download script supports.
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Introduce a reproducible development environment so the project builds and tests the same way on any machine. The flake provides the pinned Rust toolchain, nightly rustfmt, and the bitcoind/electrs binaries the integration tests need; .envrc loads it via direnv and the justfile wraps the common check/fmt/test commands to mirror CI's gates.
bitcoind is pinned to 27.1 from an older nixpkgs rev because the tests' bundled corepc-node only decodes the 27.x getblockchaininfo RPC schema; the current 25.11 channel ships 30.0 and fails decoding.
For electrs we package the exact prebuilt esplora binary CI downloads and patch it for NixOS rather than using nixpkgs' blockstream-electrs. The nixpkgs build is much newer and its initial regtest indexing takes around 80 seconds, which overruns the tests' chain sync timeout and makes every integration test fail locally. Building that old revision from source under the current toolchain is fragile, so reusing the same binary CI runs is the cheapest way to match its behaviour. The prebuilt only exists for x86_64 linux and macOS, the two platforms the download script supports.