PatternKit has a production-shaped messaging backplane facade example for request/reply, pub/sub, idempotency, outbox, and mailbox-backed subscribers. Add generated declarations for common backplane topologies.\n\nAcceptance criteria:\n- Add generator attributes for command endpoints, request/reply contracts, subscribers, and topology metadata.\n- Generate strongly typed host/client registration helpers.\n- Include TinyBDD generator/runtime/example coverage.\n- Document fluent and generated usage side by side.\n- Include IServiceCollection and Generic Host integration.\n- Land green on CI, docs, CodeQL, and coverage.
PatternKit has a production-shaped messaging backplane facade example for request/reply, pub/sub, idempotency, outbox, and mailbox-backed subscribers. Add generated declarations for common backplane topologies.\n\nAcceptance criteria:\n- Add generator attributes for command endpoints, request/reply contracts, subscribers, and topology metadata.\n- Generate strongly typed host/client registration helpers.\n- Include TinyBDD generator/runtime/example coverage.\n- Document fluent and generated usage side by side.\n- Include IServiceCollection and Generic Host integration.\n- Land green on CI, docs, CodeQL, and coverage.