README: add a Codex section with both connection methods (HTTP url entry
and the stdio shim), matching the schema codex 0.142.3 writes; note that
AgentReceive's wait_seconds blocks a ComfyUI worker; add COMFY_BRIDGE_TMP_TTL
to the env-vars table. Design doc: add a decisions-log line recording that
the MCP server ships on a separate daemon-thread side port (9188, /mcp).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
