test(core): add orchestration coverage for gate and Bob flows

Validated replacement for legacy PR #468. Adds current-main coverage for GateEvaluator and BobOrchestrator, fixes stale .aios-core fixture paths, and clarifies the 1-hour elapsed-time fixture after review.\n\nValidation:\n- npm test -- tests/core/gate-evaluator.test.js tests/core/orchestration/bob-orchestrator.test.js --runInBand --forceExit\n- npm run lint\n- npm run typecheck\n- git diff --check origin/main...HEAD && git diff --check\n- npm test -- --runInBand --forceExit\n- GitHub checks rerun green on PR #689

Author: rafaelscosta