bb-dsl 0.3.2

Authoring DSL for the bytesandbrains framework — Module trait, Graph, Output, contracts, placeholders, concrete-component plumbing.
bb-dsl-0.3.2 has been yanked.

Authoring DSL for bytesandbrains. Output handles, Contract traits, placeholders, and ConcreteComponent. Depends only on bb-ir. Module::build() records the composition tree into one ModelProto that bb-compiler consumes separately.