Add Dependabot config and coverage badge

Author: claude

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

README.md

@@ -1,6 +1,7 @@
 [![PyPI](https://img.shields.io/pypi/v/runcycles)](https://pypi.org/project/runcycles/)
 [![CI](https://github.com/runcycles/cycles-client-python/actions/workflows/ci.yml/badge.svg)](https://github.com/runcycles/cycles-client-python/actions)
 [![License](https://img.shields.io/badge/license-Apache%202.0-blue)](LICENSE)
+[![Coverage](https://img.shields.io/badge/coverage-85%25+-brightgreen)](https://github.com/runcycles/cycles-client-python/actions)
 
 # Cycles Python Client