- Add back_populates to SessionBranch.session ↔ AISession.branches to fix SQLAlchemy InvalidRequestError that broke all backend tests - Remove unused 'tree' variable in command-palette.spec.ts - Suppress setState-in-effect lint rule in TaskLane (intentional sync) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>