feat(skills): add agent-browser option for browser automation (#1090)

Add configurable browser automation allowing users to choose between
Playwright MCP (default) and Vercel's agent-browser CLI.

Changes:
- Add browser_automation_engine.provider config option
- Dynamic skill loading based on provider selection
- Comprehensive agent-browser CLI reference (inline in skills.ts)
- Propagate browserProvider to delegate_task and buildAgent
- Update documentation with provider comparison

Co-authored-by: Suyeol Jeon <devxoul@gmail.com>
Co-authored-by: YeonGyu Kim <code.yeongyu@gmail.com>

assets/oh-my-opencode.schema.json

@@ -38,6 +38,7 @@
         "type": "string",
         "enum": [
           "playwright",
+          "agent-browser",
           "frontend-ui-ux",
           "git-master"
         ]
@@ -2172,6 +2173,19 @@
           "type": "boolean"
         }
       }
+    },
+    "browser_automation_engine": {
+      "type": "object",
+      "properties": {
+        "provider": {
+          "default": "playwright",
+          "type": "string",
+          "enum": [
+            "playwright",
+            "agent-browser"
+          ]
+        }
+      }
     }
   }
 }