Add seaport 1.6 deployment scripts

[lfportal]

Adds Seaport 1.6 and ImmutableSignedZoneV3 deployment scripts.

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Note

Adds scripts and tooling to deploy ConduitController, ImmutableSeaport, and ImmutableSignedZoneV3 via CREATE2 with address precheck, plus README and a network-aware deploy wrapper.

• Deployment Scripts (Foundry):
  • script/trading/seaport16/DeployConduitController.s.sol: Deploys KEYLESS_CREATE2, Create2 factories, and ConduitController (skip-if-exists; raw signed tx usage).
  • script/trading/seaport16/DeployImmutableSeaport.s.sol: Deploys ImmutableSeaport via AccessControlledDeployer + IDeployer (CREATE2), verifies expected address before broadcasting.
  • script/trading/seaport16/DeployImmutableSignedZoneV3.s.sol: Deploys ImmutableSignedZoneV3 via CREATE2 with precomputed address checks against ImmutableSeaport.
• Tooling & Docs:
  • script/trading/seaport16/deploy.sh: Network-aware wrapper (mainnet/testnet), dry-run/broadcast, Blockscout verification, Ledger HD path support.
  • script/trading/seaport16/README.md: Usage, required env vars, and deploy targets.

^{Written by Cursor Bugbot for commit 2ec1285. This will update automatically on new commits. Configure here.}

[ermyas]

Should this come earlier? given the above code might be a bit moot if this contract is already deployed?

[lfportal]

The code above serves as a sanity check to prevent accidental deployment AND accidental skipping deployment (e.g. if the zone code changes but we forget to update the expected address constant).

[cursor]

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