docs: build-time deep dive notes (root cause, verified results, next bottleneck)

perf(deploy): scope TS connection to demo DB + monthly-rotating database (250s -> <1s table imports)

chore: check in async-TML-import investigation (repro/perf harness + handoff docs)

docs: liveboard handoff + data-upgrade working plan

Wire single blueprint pipeline; fix engine formula fidelity + insight direction

fix: harden dataset and ThoughtSpot deployment recovery

fix: enforce demo-safe data and liveboard layout

fix: improve run diagnostics and ts recovery

Merge remote-tracking branch 'hf-test/main' into develop

feat: add liveboard blueprint planning

fix: improve specialized dataset dimensions

feat: add temporary-password onboarding flow

feat: add deployment notifications and tested demo updates

feat: add scenario contract extraction for dataset-first demos

feat: add dataset-first generation path