Add Farmerless Dev Node with Manual Block Production RPCs

[jfrank-summit]

Summary

Introduces a new developer utility binary (subspace-farmerless-dev-node) that enables running consensus and domain nodes without a farmer, with optional manual block production via JSON-RPC endpoints. Refactors RPC configuration in test services to support optional RPC endpoints while maintaining backwards compatibility.

Other Changes

• Add RUSTSEC-2025-0118 (wasmtime unsound API vulnerability) to rustsec audit ignore list until polkadot-sdk dependency upgrades wasmtime from 8.0.1.
• .gitignore updated to exclude .vscode directory

Motivation and Context

Developers need a lightweight way to:

• Test consensus and domain flows without spinning up a full farmer
• Manually control block production for debugging and integration testing
• Run consensus and domain nodes with RPC access for inspection

Previously, developers had to use complex test harnesses or run full nodes. This PR provides a simple, standalone binary that wraps existing test service helpers.

Implementation Details

New Binary: subspace-farmerless-dev-node

A CLI tool that:

• Starts a consensus node (mocked farmerless setup)
• Optionally starts an EVM domain node
• Supports automatic block production (configurable interval) or manual production via RPC
• Exposes JSON-RPC endpoints for manual block control

Key Features:

• --block-interval-ms: Set automatic block production interval (0 disables)
• --domain: Enable EVM domain node
• --rpc-host/--rpc-port: Configure consensus RPC endpoint
• --domain-rpc-host/--domain-rpc-port: Configure domain RPC endpoint

Manual Block Production RPCs

When RPC is enabled (via --rpc-host/--rpc-port), exposes two JSON-RPC methods for manual block production:

• dev_produceBlock: Produce a single consensus block
  • Optional wait_for_bundle parameter to wait for domain bundle submission
• dev_produceBlocks: Produce multiple consensus blocks
  • Required count parameter
  • Optional wait_for_bundle parameter

RPC Configuration Refactoring

subspace-test-service:

• Introduced MockConsensusNodeRpcConfig struct to consolidate RPC configuration parameters
• Added run_with_rpc_builder() and run_with_rpc_options() methods
• RPC is disabled by default (backwards compatible)
• Only enables RPC when rpc_addr is provided

domain-test-service:

• Added rpc_addr() and rpc_port() builder methods to DomainNodeBuilder
• RPC configuration passed through to node_config()
• RPC is disabled by default (backwards compatible)
• Only enables RPC when rpc_addr is provided

Benefits:

• Reduces argument count (addresses clippy warnings)
• Cleaner API with configuration struct
• Maintains backwards compatibility for existing test code

Testing

• Manual testing performed:

  • Binary starts successfully with various flag combinations
  • Manual RPC endpoints work correctly
  • Auto block production works correctly
  • Shutdown handles Ctrl+C gracefully
  • Domain node integration works when --domain flag is used
  • Auto SDK integration tests pass targeting the new binary

• Existing tests remain unaffected (backwards compatibility maintained)

Code contributor checklist:

• I have read, understood and followed contributing guide

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