Foundation (ce7470d5) + reader rewire (2f7fdd40).
- ColumnSnapshot per col (i64/f64/str_ids) + StringPool per-State
- compute_visible_rows filter/sort uses snapshot direct numeric/id compare
- StringPool realloc-crash fix (reserve before emplace_back)
- Pool staleness sentinel (rebuild when string_pool.size() drift)
- High-cardinality cap (>2048 unique → skip interning, fallback raw)
API publica intacta. Bench 100k sort_numeric +131% vs baseline.
text_editor_smoke RED preexisting unrelated.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
egutierrez
3a8b4c2179