chore(mcp): add @rlwj-lab/opsxdb-mcp npm launcher package

Node wrapper that spawns the Go opsxdb-mcp binary (OPSXDB_MCP_BIN / PATH).
Ready for npm publish --access public (requires 2FA OTP).

packages/opsxdb-mcp/README.md

@@ -0,0 +1,49 @@
+# @rlwj-lab/opsxdb-mcp
+
+MCP (Model Context Protocol) launcher for OpsxDB.
+
+This package ships a small Node CLI that **spawns the Go `opsxdb-mcp` binary** over stdio. Build the binary from the OpsxDB repo, then point the launcher at it.
+
+## Install
+
+```bash
+npm i -g @rlwj-lab/opsxdb-mcp
+# or
+npx -y @rlwj-lab/opsxdb-mcp
+```
+
+## Build the Go binary
+
+From the OpsxDB repository:
+
+```bash
+cd server && go build -o ../bin/opsxdb-mcp ./cmd/opsxdb-mcp
+```
+
+Put `bin/opsxdb-mcp` on `PATH`, or set:
+
+```bash
+export OPSXDB_MCP_BIN=/absolute/path/to/opsxdb-mcp
+```
+
+## Cursor / Claude Desktop
+
+```json
+{
+  "mcpServers": {
+    "opsxdb": {
+      "command": "npx",
+      "args": ["-y", "@rlwj-lab/opsxdb-mcp"],
+      "env": {
+        "OPSXDB_MCP_BIN": "/absolute/path/to/opsxdb-mcp"
+      }
+    }
+  }
+}
+```
+
+Config: `~/.opsxdb/mcp.json`, `~/.opsxdb/connections.json`.
+
+## License
+
+MIT