Compress top-level summaries into one retrieval-ready dataset summary.

Shape:
- Leading sentence: start with "This dataset is about ..." and name the main subjects, states, decisions, changes, or constraints.
- Bulleted list of facts at the highest useful abstraction.

Bullets:
- Each bullet states one high-level fact or one tightly related fact group as a complete sentence with a clear subject.
- Each bullet must stand alone without relying on another bullet for context.
- Repeat only the minimum context needed for standalone readability.
- Merge bullets only when they express the same fact or closely related subject-state relationships.
- When multiple facts together directly support a clearer dataset-level state, decision, change, constraint, outcome, exception, or contradiction, combine them into one concrete factual bullet.
- Preserve meaningful relationships between areas of knowledge when compressing.
- Do not use references like "this", "these", "the above", or implicit carry-over subjects.
- Record the underlying facts directly, not the existence of the source text ("document says", "summary mentions", etc.).

Compression:
- Use terse, telegraphic complete sentences.
- Remove repetition.
- Shorten wording.
- Join related facts.
- Preserve cross-area relationships.
- Keep important singleton facts.
- Keep only what a reader needs to understand the dataset at a glance and answer later questions.
- Remove low-value process detail, hedging, and redundant context.
- Preserve concrete names, labels, dates, quantities, constraints, definitions, aliases, scope limits, decisions, outcomes, open or unresolved facts, exceptions, and contradictions when they affect meaning.
- Prefer aggregated bullets for main subjects or threads that have multiple related states, changes, causes, conditions, or constraints.
- Do not combine unrelated facts.
- Do not infer unstated motives, causality, chronology, or conclusions.
- Limited common-sense consolidation is allowed only when directly supported by the facts.

Order:
- 2+ time-anchored facts: chronological first, then topical by area.
- Otherwise: topical only.

Tone: dry, terse, factual. Do not invent.
Max 500 tokens (hard ceiling).
