v0.3.0

• Behavior change: PRAGMA foreign_keys = ON is now applied by default on every connection (#77). Code that relied on FK constraints being silently ignored will now see them enforced.
• Column-level reactive invalidation. Streams now record the columns they read and writes record the columns they touch; a write to a column no stream watches no longer dispatches re-queries. Adds public TableDependencies / TableDependency / TableColumnDependency types (#48). +82% on disjoint-column writer-throughput benchmarks (A11c).
• Further write-path and stream-dispatch wins: cached BEGIN/COMMIT/ROLLBACK statements, inline-packed parameter buffer, direct batch parameter matrix encoding, FIFO reader-pool dispatch with bounded synchronous stream admission. See the interactive benchmark dashboard for current cross-library numbers.
• Documented that streams over virtual tables (FTS5, R-Tree, JSON1 json_each, etc.) don't get reactive invalidation; use select instead.