Integrate rtichoke_viz v0.3.0 renderer selection

[uriahf]

Summary

• vendor the exact immutable rtichoke_viz v0.3.0 release archive and extracted runtime assets
• preserve the existing Plotly default while adding staged gains selectors for matplotlib, browser, and rtichoke_viz
• render non-Plotly backends only from the merged canonical gains v2 spec, retaining evaluation, model, population, series, display-group, and reference-ownership semantics
• keep Matplotlib optional and browser output fully offline with no Node.js or network requirement

Verification

• archive SHA-256: 558f8d9e16f9544659b84e33f72511065163291a1b97a3c5511b61d1e1f0cac1
• uv run ruff check .
• uv run ruff format --check .
• uv run ty check src/rtichoke
• uv build
• uv run pytest tests (201 passed)
• verified the built wheel contains the vendored archive with the required SHA-256

Scope

This intentionally stages public renderer selection on gains, whose canonical v2 builder was merged in #376. The shared selector and browser chart abstraction use consistent names and chart dispatch for later ROC, calibration, and precision-recall adoption; no statistical calculations were changed.

[github-actions]

PR Preview Action v1.8.1
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2026-08-23 03:31 UTC