Summary

• refactor perpetual decrease quote/plan request contracts to a shared outer object with nested decrease discriminated union (full | partial)
• update and harden registry schema tests for nested decrease payloads and explicit rejection of legacy top-level mode/full/partial payloads
• export decrease quote/plan request schemas from endpoint interfaces and add endpoint-interface unit coverage
• restore missing root Vitest setup files at typescript/tests/setup/ so workspace-level Vitest commands stop failing on missing setup path

Test Plan

• pnpm -C typescript lint
• pnpm -C typescript build
• pnpm -C typescript test:ci
• pnpm -C typescript exec vitest run --dir onchain-actions-plugins/registry

Notes

• This is an intentional breaking contract change for perpetual decrease request shape (internal codebase policy: update call sites directly, no compatibility aliases).