fix agentTokenV3._autoswap() uniswap invalidTo error

[koo-virtuals]

Note

Medium Risk
Changes the on-chain tax autoswap path for AgentTokenV3 by introducing a new adapter contract and additional approvals/external calls; misconfiguration (unset adapter) or integration issues with routers/tax recipients could block autoswaps or leave funds temporarily held on the adapter.

Overview
Fixes AgentTokenV3 autoswap failures caused by Uniswap V2 pair INVALID_TO by routing tax swaps through a new upgradeable TaxAccountingAdapter that receives swap output and then calls depositTax on the tax recipient.

AgentTokenV3._swapTax now requires taxAccountingAdapter to be set, delegates swap+deposit to the adapter (with allowance reset), and factors the pending-tax accounting into a helper. The Uniswap router mock was enhanced to actually move tokens for swapExactTokensForTokensSupportingFeeOnTransferTokens, and tests were refactored/extended with a shared fixture plus a new E2E suite covering adapter-based autoswap + depositTax attribution.

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