Restore hosted authored-Scene artifact parity

[DecisionNerd]

Summary

• add the bounded three-point reference scatter series to the Node hosted authored-Scene generator
• preserve the Python generator record, style, and legend order exactly
• restore byte-identical Python/Node artifacts at all four hosted evidence tiers

Validation

• exact artifact verifier at 100, 10K, 100K, and 1M points
• Rust SVG, raster, and browser-painter artifact checks
• Rust Scene tests (51 passed)
• focused Python Scene/export tests (264 passed)
• full Node suite (199 passed)
• browser render smoke
• ownership audit, Ruff, formatting, and full pre-commit

Advances #116 by repairing the changed-main hosted evidence path.

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Summary by CodeRabbit

• New Features
  • Added the fixture’s bounded reference circle series as a direct scatter layer in authored scene benchmarks.
  • Preserved the series’ data, metadata, styling, legend entry, and scene structure across benchmark tiers.

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Reviewing files that changed from the base of the PR and between 6f4289b and d0a753b.

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• packages/xy-node/scripts/generate_authored_scene_benchmark.mjs

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📝 Walkthrough

Walkthrough

Changes

Authored scene benchmark

Layer / File(s)	Summary
Add authored circle scatter layer packages/xy-node/scripts/generate_authored_scene_benchmark.mjs	authoredScene adds the bounded reference circle series as a direct scatter layer. The layer preserves its coordinates, metadata, styling, legend row, and scene structure across benchmark tiers.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to d0a75

This localized generator update restores hosted authored-Scene artifact parity, and no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: restoring parity between hosted authored-Scene artifacts.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/authored-scene-artifact-parity

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