docs: add OPC ecosystem cross-links

Author: MackDing

README.md

@@ -491,3 +491,19 @@ Telegram can manage runtime usage of Bot-side MCP and skills, but not install ar
 - Inspired by: https://github.com/RichardAtCT/claude-code-telegram
 - Codex SDK reference: https://github.com/coleam00/codex-telegram-coding-assistant
 - This implementation: Codex-first Node.js stack (`@openai/codex-sdk`, `telegraf`, `node-pty`, `node-cron`, MCP SDK)
+
+
+---
+
+## 🦞 OPC Ecosystem
+
+> Built by [@MackDing](https://github.com/MackDing) — One-Person Company infrastructure powered by AI agents.
+
+| Project | What it does |
+|---------|-------------|
+| [**opc.ren**](https://opc.ren) | OPC founder hub — tools, signals, community |
+| [**CodexClaw**](https://github.com/MackDing/CodexClaw) | Telegram bot for remote Codex access with MCP + subagent routing |
+| [**awesome-ai-api**](https://github.com/MackDing/awesome-ai-api) | Leaderboard of 200+ AI API gateways & relays |
+| [**claude-context-health**](https://github.com/MackDing/claude-context-health) | Diagnose & fix Claude Code session degradation |
+| [**opc-daily-signal**](https://github.com/MackDing/opc-daily-signal) | AI-powered daily decision intelligence for OPC founders |
+| [**doc-preprocess-hub**](https://github.com/MackDing/doc-preprocess-hub) | Enterprise document preprocessing — MinerU + docling |