Generated tests: schema-driven contract integration for emitted apps

[snissn]

Resolves #29.

Scope implemented

• Upgraded generated app contract tests from static smoke-only checks to schema-driven on-chain integration behavior tests.
• th generate --with-tests now emits ui/tests/contract/integration.mjs that:
  • compiles generated ../contracts/App.sol,
  • deploys to local anvil,
  • runs per-collection behavior checks for create/list/get,
  • runs update/delete/transfer checks when enabled,
  • enforces paid-create failure/success behavior for payment-enabled collections.
• Generated app test scripts now run the integration harness by default for test:contract.
• Added repo integration test that proves emitted generated-app contract tests run for canonical job-board output.

Validation

• pnpm test
• pnpm test:integration
• pnpm typecheck