feat: local PoW via nano-rspow with remote fallback#2
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Integrate nano-rspow as the default PoW backend for Nano blocks, replacing the previous 100% remote RPC approach. - Add nano-rspow (CPU via rayon) behind 'local-pow' feature (default on) - PoW mode defaults to 'auto': local first, remote RPC fallback - NANO_POW_MODE env var: 'auto' (default), 'local', 'remote' - NANO_WORK_URL continues to provide additional remote endpoints - Remove hardcoded FALLBACK_WORK_URL (rpc.nano.to) - Downstream can opt out with --no-default-features
- Remove hardcoded SEND_DIFFICULTY/RECEIVE_DIFFICULTY hex constants - Re-export EPOCH2_SEND/EPOCH2_RECEIVE from nano_rspow::thresholds (with fallback consts when local-pow feature is disabled) - work_generate now accepts u64 threshold, converts to hex for RPC - Rename NANO_POW_MODE to NANO_WORK_MODE to align with NANO_WORK_URL
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Adds local Nano PoW support through
nano-rspow, with remote RPC fallback when local work is not recommended or local generation fails.NANO_WORK_MODEoptions:auto: default; use local PoW only whennano-rspowrecommends it.local: force local PoW and fail if local generation cannot produce work.remote: force remote RPC PoW and skip local generation.retune: clear thenano-rspowtuning and recommendation cache, then behave likeauto.NANO_WORK_URLcontinues to support additional remote work endpoints separated by commas or semicolons. The public hex-difficultywork_generateAPI remains compatible, while internal OWS code can continue using the threshold-based helper andnano-rspowthreshold constants.