Adds docs/dev/analysis/chartex-waterfall.rst — a tighter-scoped companion to the broader chartex-foundation (F4) note and a sibling to chartex-funnel, focused specifically on the waterfall chart authoring path: the cx:series shape with layoutId="waterfall", the cx:layoutPr/cx:subtotals/cx:subtotal block that marks individual bars as subtotal anchors (the defining waterfall visual), and the cx:visibility/@connectorLines toggle for the step-lines between bars. Documents the two cx:axis children waterfall requires (unlike funnel), the "outEnd" default dataLabels position, and first-class negative-value support. Proposes a minimal CategoryChartData subtotal_indices attribute as the MVP authoring-API surface, with a richer per-category is_subtotal kwarg deferred to follow-up work. Documents the issue as blocked on full F4 implementation (currently only Wave 1 scanny#386 passthrough + Wave 3 scanny#583 design analysis + Wave 6 scanny#305 funnel analysis are in master) and ships a concrete checklist covering the F4 prerequisites and the scanny#479/scanny#651-specific deliverables for when F4 unblocks. Notes that the existing in-tree fixture features/steps/test_files/cht-chartex.pptx is already a PowerPoint-authored waterfall and can serve as the round-trip parsing fixture, with a richer second fixture proposed for exercising the subtotal and connector-line code paths. scanny#479 and scanny#651 are the same ask; this analysis resolves both as a pair. Links the new page into the analysis index.rst toctree and adds a HISTORY entry under Unreleased. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Add Funnel Charts #305

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