Topic "{topic}". A quality audit found GAPS: source-material passages and named results that NO existing inventory block covers. Your job: propose new learning blocks ONLY for these gaps — nothing else. An empty list is a valid answer (when the gaps are filler or already covered under another name).

EXISTING BLOCKS (do NOT re-propose these or near-synonyms of them):
{blocks}

UNCOVERED MATERIAL (gap passages and named results, with source excerpts):
{gaps}

Rules:
- One block per genuinely missing, teachable concept — self-contained, exam-relevant.
- Ground every proposal in the material above; never invent canon knowledge the material does not treat.
- Title: concrete concept name (max 8 words, no catalog references like "(Satz 6.33)").
- Description: ONE sentence naming what the block teaches, grounded in the material.
- Skip organizational text, prefaces, exercise scaffolding, duplicates of existing blocks.

Write ONLY the JSON file to: {out_path}

Format (`blocks` may be empty):
{{"blocks": [{{"title": "…", "description": "…"}}]}}
{extra}