Empty responses

When the model under test returns what looks like an empty response, what actually happened, and how should the scorer route it? Started from inspect_evals#2415. This is the first experiment run under docs/framework.md.

Status: design approved at gate 1 (2026-10-22, budget ceiling $200). Smoke-tested for $4.41; gate 2 approved on 2026-10-23 (notes/gate-2.md), with amendments A1-A9 and the analysis frozen at 4a61367. Next: the main run.

File What
question.md the question, the decision it informs, and what is known
spec.md the pre-registration, approved at gate 1
experiment.yaml stage, gates and budget
plan.md the run order, with commands, to gate 2 and beyond
RULINGS.md decisions taken during the build
configs/ the run configs, written from _common.yaml by make_configs
notes/code-survey.md how inspect_ai and inspect_evals produce and score empty replies today
notes/eval-scoring.md how each eval scores a sample and computes its headline
notes/exposure.md the exposure search: evals with unguarded judges, tight max_tokens, and so on
notes/review-1.md an independent review of the first draft spec
notes/exploration.md non-answers in logs we already hold
notes/gate-2.md the gate 2 request: smoke results, re-estimate, amendments
results/smoke/ the smoke analysis tables