Remove legacy Hardhat deployment scripts

[clement-ux]

Why

Deployments have moved to Foundry, but the repository still contained 129 old hardhat-deploy scripts and the helpers built around them. They were no longer the deployment system, yet generating @origin/defi could still load and execute that old pipeline.

This PR removes the executable Hardhat deployment path while keeping the operational tools that still need historical deployment information.

What changes

• remove the 129 legacy scripts under contracts/deploy/**
• remove deploy-only helpers and npm commands
• stop ABI generation from running hardhat deploy
• keep only the small network, unit, funding and governance helpers still used by operational tasks
• point the deployment-verification skill at the Foundry deployment scripts

At this point in the stack, ABI generation uses a clean Hardhat compilation only; follow-up #2985 replaces that final compilation with Foundry.

What stays

deployments/** is intentionally kept. These files are not executable deployment scripts: they are the address and ABI records used by Talos and other operational tasks to find existing contracts.

hardhat-deploy also remains as a read-only adapter for those records. It is no longer used to deploy anything.

Stack

This PR is intentionally based on #2982, not master:

1. Remove legacy Hardhat contract tests #2982 — remove legacy Hardhat contract tests
2. Remove legacy Hardhat deployment scripts #2983 — remove legacy Hardhat deployment scripts
3. Generate ABI package with Foundry #2985 — generate the ABI package with Foundry

Validation

• @origin/defi generation succeeds without executing deployments: 292 ABI files
• Hardhat governance tasks execute and executeOnFork load successfully
• pnpm run test:tasks: 22 passing
• pnpm run test:scripts: 61 passing
• pnpm run test:layouts: 11 passing
• forge build contracts/ --force -j 1
• JavaScript/TypeScript lint, typecheck, Prettier and git diff --check pass

[sparrowDom]

LGTM