glm-5.1
a248698f40
Replace the Vercel AI SDK with direct OpenAI SDK calls and a custom AgentLoop. The AI SDK has zero runtime integration today, so removing it costs nothing. Supply chain risk (2-5 releases/day, April 2026 Vercel breach, bus factor of 1) makes it a liability we don't need. Key changes: - ADR-018 accepted: openai package (zero runtime deps) replaces ai SDK - AgentLoop handles multi-step tool execution explicitly (~300 LOC vs AI SDK's ~2700 LOC streamText) - Hub owns UIMessage/UIPart/ToolCallState types (extends ADR-016) - Hub owns streaming protocol (subset of AI SDK's UIMessageChunk wire format with step boundaries, error handling, usage tracking) - operationToOpenAITool() maps TypeBox schemas directly, no adapter - Trade-off: ~1100 LOC total new code for the savings of 6+ transitive deps, supply chain risk, and release cadence coupling Updates AGENTS.md constraints and dependencies, adds OQ-63/OQ-64/OQ-65 and Theme 11 (Inference & LLM Integration) to open questions.