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

Side B fixes a real production bug (Reddit blocking cloud IPs via public API fallback) with a robust auth-rejection/retry mechanism, better error messages, and a config pin, backed by a new test. Side A is mostly a refactor/removal of demo scaffolding plus a settlement-worker rewrite for ranking caching, which is reasonable engineering but less impactful and riskier (async batching complexity) without clear bug motivation.