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303c2be38d
weed fix -ecx reconstructs the .dat from the local data shards, scans the needles, and writes a fresh ascending-sorted .ecx containing only live entries — the same on-disk index WriteSortedFileFromIdx emits at encode time. When the .vif is also missing it is regenerated from the inferred EC ratio (flags > .vif > shard-count inference / 10+4) and the .dat size recovered from the scan. When some data shards are missing but at least dataShards shards survive, the missing shards are first reconstructed from the survivors via Reed-Solomon, so a partial shard set is repaired too. Also makes erasure_coding.WriteDatFile de-stripe using len(shardFileNames) instead of the DataShardsCount constant, so the caller's actual data-shard count is honored (behavior-preserving for the default 10, and fixing the existing caller that already passes ECContext.DataShards). This recovers an EC volume whose sealed index was lost from every node while enough shards survive, a state neither ec.rebuild nor ec.decode can repair because both require an existing .ecx. Flags: -ecx, -ecDataShards, -ecParityShards. Run with the volume server stopped.