Point-in-time records: research, tool reviews, and scope/planning memos written to think a decision through. Unlike docs/spec/ (the contract — the what) and docs/architecture/ (the maintained how), nothing here is kept current — each file reflects what was known when it was written. Decisions that survived are folded into the spec and architecture; these remain as the reasoning behind them.

Active follow-up work is tracked in ../IMPLEMENTATION-PLAN.md, not here. Exact figures in these files (timings, line counts, test counts) are frozen snapshots, not live numbers.

chart-builder-research.md — cross-source chart-choice research (Draco, Voyager, FT Visual Vocabulary, Datawrapper).
lyra-review.md — review of vega/lyra for Chart Builder interaction ideas.
chart-builder-enhancement-scope.md — consolidated Tier-B → Tier-C forward plan for the Chart Builder.
chart-theming-scope.md — chart theming plan and slice breakdown.
monetization-and-sync-exploration.md — monetization + BYO-cloud-sync direction memo.