Add MCP client setup docs

Author: gamblecodezcom

README.md

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+# Runewager
+
+Unified MCP setup lives in `docs/MCP.md`.

docs/MCP.md

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+# MCP Client Setup (Codex / Claude / Cursor)
+
+Use the unified MCP endpoint:
+
+```json
+{
+  "mcpServers": {
+    "gcz-mcp": {
+      "url": "https://ai.gamblecodez.com/mcp",
+      "headers": {
+        "Authorization": "Bearer ${GCZ_MCP_TOKEN}"
+      }
+    }
+  }
+}
+```
+
+Notes:
+- Set `GCZ_MCP_TOKEN` in your environment or secrets manager.
+- For GitHub Actions, store `GCZ_MCP_TOKEN` in the `MCP` environment secrets and use `https://ai.gamblecodez.com/mcp`.