Kickside Blocks

The source implements one closed kickside.block/v1 declaration contract:

• contract.lua validates declarations and instance config.
• lower.lua maps one Block to one native function, Agent, or durable wait node.
• blocks.lua exposes discovery, exact resolution, description, and headless planning.
• tool_adapter.lua projects visible public registry tools into that same catalog without a wrapper or an Agents/Workflows dependency.
• await.lua is the native durable wait node; resume.lua resumes it under the Flow's frozen execution identity.

There is no runtime declaration lookup, wrapper execution tool, graph-builder return value, compatibility alias, or alternate Block dialect.