docs: specify Assisted-by tag for Claude Code commits

Add guidance to CLAUDE.md requiring Claude-generated commits to use
Assisted-by instead of Co-Authored-By tag format.

Assisted-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Molter73

CLAUDE.md

@@ -172,3 +172,4 @@ For arm64, use `-D__TARGET_ARCH_aarch64` instead.
 - Pytest integration tests require a built container image (use `make image` first)
 - The project uses `sudo -E` to preserve environment variables when running with elevated privileges
 - SIGHUP triggers configuration reload without restarting the process
+- **Commit messages**: All commits generated by Claude should include `Assisted-by: <agent-version>` instead of `Co-Authored-By`