v0.1.13

Added

• Implement contracted operations with command.handler(handler, options?) and
  query.handler(handler, options?) in both Promise and Effect registries.
• Infer each handler's input and result from its operation object key, without
  repeating the operation name; preserve existing named helpers.

Verified

• Cover contract binding, validation, audits, and handler inference with 684
  runtime tests and strict type fixtures.
• Compile the documentation examples and test packed npm/Bun consumers with
  and without Effect.