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Chris Lu
e610dad2a1
Implement the gRPC service surface of the pushdown daemon: - Service struct embeds the generated UnimplementedSeaweed ParquetPushdownServer, exposes Ping (returns version + trust mode) and Pushdown (returns Unimplemented after request-shape validation). - request_validation.go enforces hard caps (max data files, columns, predicate bytes, row-id cap, vector dim, top_k) and content-type rules (Puffin DV requires blob_length + referenced_data_file; equality delete requires equality_field_ids; predicate_kind and predicate must be set together). - stats.go is a small accumulator that produces a PushdownStats message stamped with trust_mode and elapsed micros; M0 wires it into the Unimplemented status's details so the stats wire format is exercised end to end. - TrustMode constants encode the design's catalog-validated (default) and connector-trusted (dev-only) modes. Unit tests cover the validation matrix (rejects empty/oversize requests, accepts well-formed vector queries, accepts well-formed deletion-vector descriptors, rejects DVs missing blob_length / referenced_data_file).