Extend the closed error catalog with the AI error codes (AI_UNAVAILABLE,
AI_BUDGET_EXCEEDED, approval lifecycle codes, AI_INJECTION_BLOCKED), add the
AgentRun/AgentToolCall/AgentConfig/CopilotSession/TriageSuggestion DTOs,
add aiEnabled to UserAdmin, and add the LLM-facing tool arg schemas plus the
zod-validated SSE event schema. Owner/version stay out of tool args per the
agentic spec (the runtime injects them).