Add CONDITIONAL_BRANCH_FANOUT warning when conditional nodes have all
connections on main[0] with higher outputs empty, indicating both
branches execute together instead of being split by condition.
Extract getShortNodeType() and getConditionalOutputInfo() helpers to
deduplicate conditional node detection logic.
Conceived by Romuald Czlonkowski - https://www.aiadvisors.pl/en
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
