#125 CRITICAL: All workers use same worker_id - breaks claim isolation

All 8 workers use hardcoded worker_id='highway_worker_1' from config.ini, ignoring ABSURD_WORKER_ID env var. Impact: - All workers appear as same worker to claim_task() - No worker isolation - can't distinguish who owns a task - Causes claim timeout failures during disruption Root cause: AbsurdClient reads worker_id from config.ini, ignores env var. Fix: Check ABSURD_WORKER_ID env var first, then fall back to config.