feat: emit artifact content + proposal_created on the event stream#25
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…tream Add `content` to the `artifact` RuntimeStreamEvent variant and a new `proposal_created` variant, so a run's event stream carries what the agent produced, not just metadata. mapCommonBackendEvent maps both from the common SSE/HTTP wire (fail-loud — drops an event with no id); the sanitizer gates `content`/`title` behind includeControlPayloads (redacted by default); trace-bridge maps proposal_created to a state_mutation trace event. This package provides the typed contract + wire mapping. The runtime does not originate these events — content events originate in the agent execution backend and pass through; backend/tool-layer emission is separate. Additive (+157, 0 deletions); 218/218 tests green.
`biome check src tests examples` ran red on two pre-existing errors: noAssignInExpressions in chat-engine.test.ts (rewrote the indexOf loop as a for(;;) + break, matching the file's existing style) and an unused import in agent.test.ts. No behavior change; 218/218 tests green.
biome check --write reflowed the produced-state wire-mapping block to satisfy the linter. No behavior change.
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Summary
Enrich the runtime event stream so a run carries what the agent produced — not just metadata. This is the emitter half of the
ProducedStatepathway (consumer half:extractProducedStatein agent-eval#69).content?: stringto theartifactRuntimeStreamEventvariant.proposal_createdvariant (proposalId,title,status?).mapCommonBackendEventmaps both from the common SSE/HTTP wire — fail-loud, drops an event with no id.content/ proposaltitlebehindincludeControlPayloads(redacted by default).trace-bridgemapsproposal_created→ astate_mutationtrace event.The runtime does not originate these — content events originate in the agent execution backend and pass through; this package provides the typed contract + wire mapping. Additive (+157 / -0).
Test plan
pnpm build— cleanpnpm typecheck— clean (new union variant handled in exhaustive consumers)pnpm test— 218/218 (new wire-mapping + trace-bridge + redaction tests)