Update README e2e test count from 4 to 9

Agent-Logs-Url: https://github.com/brunosantos/garmin-workouts-mcp/sessions/bc06c49a-9543-465a-a9a4-bfd1f265fc50

Co-authored-by: brunosantos <495067+brunosantos@users.noreply.github.com>

Author: Copilot

README.md

@@ -268,4 +268,4 @@ uv run pytest tests/e2e/ -m e2e -v
 ### Test Structure
 
 - **Integration tests** (49 tests): Test all MCP tools using FastMCP integration with mocked Garmin API responses
-- **End-to-end tests** (4 tests): Test with real MCP server and Garmin API (requires valid credentials)
+- **End-to-end tests** (9 tests): Test with real MCP server and Garmin API (requires valid credentials)