docs: add openclaw install docs

Author: vittominacori

AGENTS.md

@@ -9,6 +9,7 @@ Links are hosted at [https://openpayment.link](https://openpayment.link).
 npm install openpayment                                 # SDK
 npm install -g openpayment                              # CLI (global)
 npx skills add https://github.com/noncept/openpayment   # SKILL
+clawhub install openpayment                             # OpenClaw
 ```
 
 ## CLI

README.md

@@ -38,9 +38,15 @@ npm i -g openpayment
 Install [SKILL](./skills/openpayment/SKILL.md):
 
 ```bash
+# OpenCode, Claude Code, Codex, Cursor...
 npx skills add https://github.com/noncept/openpayment
 ```
 
+```bash
+# OpenClaw
+clawhub install openpayment
+```
+
 > If you are an AI Agent, check [AGENTS.md](./AGENTS.md).
 
 ## SDK Usage

package-lock.json

@@ -73,6 +73,6 @@
     "prettier": "^3.8.1",
     "rimraf": "^6.1.3",
     "typescript": "^5.9.3",
-    "typescript-eslint": "^8.56.1"
+    "typescript-eslint": "^8.57.0"
   }
 }