Add encoded derived convenience chart overloads

Completes phase H2 of the encoded array support plan by adding
encoded overloads for derived convenience constructors across
Chart2D, Chart3D, ChartCarpet, ChartDomain, ChartMap, ChartPolar,
ChartSmith, and ChartTernary. Pareto, Residual, and AnnotatedHeatmap
are intentionally excluded since they perform in-F# computation
over their input arrays.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kMutagene

AGENTS.md

@@ -112,6 +112,7 @@ When adding a new chart type or API surface, add or update the corresponding `.f
 - The core library is designed for C# interop — when adding public API, consider how it looks from C# (see the FAQ in [README.md](README.md) and [issue #285](https://github.com/plotly/Plotly.NET/issues/285)).
 - Release targets (`release`, `prerelease`) expect a `NUGET_KEY` environment variable. Don't run these unless you actually intend to publish.
 - Main branch for PRs is **`dev`**, not `main`/`master`.
+- when prompted for planning the implementation of a feature, draft a plan file and put it into /plans. Use that document to split the planned commits for the feature into self-contained commits that include tests. When working on the feature, continuously update the plan with implementation notes and mark the planned commits as done when they are implemented.
 
 ## License