Purpose: explain how the corpus evolved and what is the official frozen set.

• corpus_v1 is the official, frozen set used for the paper baseline.
• It contains 60 scenarios across 7 families.

• Initial corpus generation focused on broad thematic coverage.
• Iterative diversification rounds reduced high pairwise redundancy.
• Final freeze keeps a practical trade-off: publishable baseline with declared limitations.

If future revisions modify scenario content or composition, they should be published under a new corpus label (for example corpus_v2) while preserving corpus_v1 for reproducibility.