[SIDDHANTCOOKIE]

Summary

This is PR 2 of the generalized transaction roadmap (stacked on PR #163). It implements the state validation and execution engine for generalized transactions in \minichain/state.py.

Key Features:

1. Balance Pool Conservation Law:
   • Enforces that the transaction pool is strictly conserved: for every asset, total withdrawals must cover total deposits and contract call endowments (unless minted by the asset creator under \ALLOW_MINT).
2. Multi-Signer Solvency & Nonce Validation:
   • Verifies that all participating senders in \withdrawals\ have sufficient balances for their debits (plus gas cost for the primary fee payer).
   • Validates nonces for all required signers against their on-chain account nonces.
3. Atomic Multi-Party Execution & Rollback:
   • Processes withdrawals (debiting senders) and deposits (crediting receivers) atomically across accounts.
   • Executes contract deployments and calls within the transaction, with support for \ ransfer_out\ and proper gas metering/refunds.
   • If any call fails, rolls back the entire state journal while charging gas used and advancing signers' nonces to prevent replay.
4. Minting & Burning Compliance:
   • Seamlessly integrates with \ALLOW_MINT\ (creators minting supply into the pool) and \ALLOW_BURN\ (depositing to \BURN_ADDRESS).
5. Zero Breaking Changes:
   • Preserves existing legacy execution paths for single-sender transactions and deployments.

Test Plan

• Added \ ests/test_generalized_state.py\ with 9 tests covering transfers shorthand execution, multi-party atomic swaps, pool deficit rejection, insufficient balance rejection, nonce mismatch rejection, minting, burning, and contract deployment/calls.
• Full test suite: 393 passed.

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