feat/piece pull client#12
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Curio's POST /pdp/piece/pull is the FWSS-mediated SP-submits flow: client posts EIP-712-signed extraData and HTTPS source URLs, Curio fetches the pieces, validates extraData via eth_call against PDPVerifier.addPieces(), and submits the on-chain tx. Idempotent on (service, sha256(extraData), dataSetId, recordKeeper). Used by singularity to push pieces to SPs without holding the SP's wallet key. Adds: - Server.PullPieces and Server.WaitForPullPieces in pdp/server.go - PullStatus, PullPieceInput, PullPieceStatus, PullPiecesRequest, PullPiecesResponse, PullPiecesOptions in pdp/types.go - EncodeCreateDataSetAndAddPiecesExtraData in pdp/abi.go for the abi.encode(bytes,bytes) wrapper used when DataSetID is 0 (atomic create-and-add path)
abi.go and server.go had pre-existing whitespace drift (extra blank lines between top-level decls, misaligned var-block alignment). CI's golangci-lint v2 default doesn't run gofmt so master accumulated the drift, but cleaning it up keeps editors+pre-commit hooks happy.
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adds support for pull piece transfers (needed by singularity refactoring and for feature completeness with synapse-sdk)