Update .gitmodules

[JOHNCARDOEN]

Note

Reorganizes and expands .gitmodules with categorized submodules and inline purpose comments.

• Config (.gitmodules):
  • Reorganization: Groups submodules by domain (DEX, Lending, Prediction Markets, Utilities, Cross-Chain).
  • Documentation: Adds concise purpose comments for each submodule.
  • Submodule updates:
    • Re-adds/ensures presence of lib/forge-std, lib/openzeppelin-contracts, lib/solmate, lib/solady, lib/solenv.
    • Includes Uniswap V3 stack: lib/uniswap-v3-core, lib/uniswap-v3-periphery, lib/uniswap-v3-staker.
    • Adds DeFi/markets libs: lib/compound-protocol, lib/conditional-tokens-contracts, lib/conditional-tokens-market-makers.
    • Adds bridge primitive: lib/fx-portal.

^{Written by Cursor Bugbot for commit 9923571. This will update automatically on new commits. Configure here.}