~anthropic/claude-sonnet-latest → A (6:4)

Commit A fixes a real correctness bug (shared sentinel delegate blocking multi-user voting), removes dead/misleading abstractions cleanly, and adds a solid integration test proving two distinct users can vote without collision. Commit B is also a legitimate bugfix (avoiding blocked public Reddit API, forcing OAuth refresh) with good error-detail handling and a unit test, but it's a narrower operational fix versus A's core multi-user correctness fix affecting fundamental voting functionality.