[vaigay]

Upgrading a consumer to aggregator-encoding v0.73.96 breaks compilation of pkg/metaaggregation: its V2 input types and packing helpers have moved from encode/v3/router to encode/v2/router.

Update the production and test imports to the V2 package and upgrade aggregator-encoding from v0.73.8 to v0.73.96. The old pinned version does not contain the new package. go mod tidy updates the required dependency graph and Go minimum to 1.25.10.

DecodeMetaAggregationSwapOutput and the V2 calldata/output format remain unchanged. Add regression coverage for valid V2 output, zero gas, and truncated output; existing calldata fixtures continue to pass. This lets the resolver retain its existing metaaggregation decoder after the ks-enc upgrade.

Validation:

• go test -race ./... passes.
• golangci-lint run --new-from-rev=main ./pkg/metaaggregation/... passes. The unrestricted scoped lint reports an existing modernize warning for [2]interface{} in the unchanged decoder.
• Resolver ETHPAMM, findroute, kyberswap, service, resolver, and cmd/app tests/build pass using a temporary module-file replacement pointing to this checkout.

Follow-up consumer: https://github.com/KyberNetwork/1inch-resolver/pull/700