PatternKit has a fluent Mailbox runtime and service-collaboration examples. Add an attribute-driven source-generated path for declaring serialized in-process inboxes.\n\nAcceptance criteria:\n- Add generator attributes for mailbox handlers, backpressure, and error policy.\n- Generate strongly typed mailbox factories with deterministic diagnostics.\n- Include TinyBDD generator/runtime/example coverage.\n- Document fluent and generated usage side by side.\n- Include IServiceCollection integration for the example surface.\n- Land green on CI, docs, CodeQL, and coverage.
PatternKit has a fluent Mailbox runtime and service-collaboration examples. Add an attribute-driven source-generated path for declaring serialized in-process inboxes.\n\nAcceptance criteria:\n- Add generator attributes for mailbox handlers, backpressure, and error policy.\n- Generate strongly typed mailbox factories with deterministic diagnostics.\n- Include TinyBDD generator/runtime/example coverage.\n- Document fluent and generated usage side by side.\n- Include IServiceCollection integration for the example surface.\n- Land green on CI, docs, CodeQL, and coverage.