feat: add deployment notifications and tested demo updates

feat: add dataset-first generation path

fix: prevent NULL inserts for NOT NULL columns (AIRCRAFT/SEAT_CAPACITY_TOTAL pattern)

feat: Data Narrative Layer — per-column value constraints

feat: tag v2 type fix, claude-opus-4-6, viz titles sprint item, DATES fix

fix: restore type coercion + DDL fallback for insert_rows

fix: stop all-rows-fail on numeric column type mismatch (22018)

fix: stabilize e2e test suite — session resilience + LegitData API call reduction

fix: remove all THOUGHTSPOT_URL admin fallbacks + data quality improvements

fix: prevent string values from being inserted into numeric columns

feat: March 2026 sprint — new vision merge, pipeline improvements, settings refactor

feat: vendor legitdata source package into repository