fix(ag-ui): graceful ACTIVITY_DELTA applyPatch + enforce assistant-role in subagent projection#694
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…le in subagent projection Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Two robustness hardening items flagged in the multi-message subagent-cards review (#692). The new structured JSON-Patch wire shape leans on index-correctness, so degrade gracefully.
reducer.tsACTIVITY_DELTA: wrapapplyPatchin try/catch — a malformed or out-of-order DELTA (e.g. areplace /messages/N/contentwhose index doesn't exist yet) now logs + drops the patch instead of throwing into theonEventsubscriber and breaking the stream.to-agent.tssubagent projection: hard-code projected transcript messages torole:'assistant'— the subagent transcript is exclusively assistant turns (tool calls live intoolCalls[]); this enforces the invariant the card relies on, so a buggy emitter puttingrole:'tool'inmessages[]can't double-render.Both TDD'd (confirmed fail→pass). ag-ui + chat lint/test green (859 tests).