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## What changed - Install the skills extension for MCP Codex tool sessions so host skills are included in the developer instructions. - Route extension warnings to the matching active MCP turn as `codex/event` notifications, preserving request and thread metadata and ordering warnings before the final tool response. - Track reply turns independently and bound forwarded warning messages to 256 UTF-8 bytes. ## Testing - Add unit coverage for active-turn routing, request ID collisions, warning ordering, filtering, and truncation. - Add an MCP integration test for host skill instructions and skills context budget warnings. GitOrigin-RevId: 9e5c699665f6889bf1103e78c3d6ca53824a10a0