data-visualization

Rendering presenter — brainstorms, selects, and renders the most impactful visualisations for producer artifacts or ad-hoc data into self-contained (or interactive) reports. Emits a frontmatter-free presentation sibling beside the canonical artifact via presentation-sibling-contract@1 (never indexed in MANIFEST.md, never a status: mutation). A strict presenter: it represents existing values and producer-supplied interpretations and never computes new findings, scores, deltas, rankings, or verdicts. Chart families: line/bar/scatter/pie plus structural no-measure marks — timeline/Gantt (time × category) and presence matrix (category × category).