Route all built-in scatter symbols through Scene exports

[DecisionNerd]

Summary

• route all 19 built-in constant scatter symbols through the public Rust-owned Scene export path
• extend the same built-in-symbol support to immediate generated stem markers
• preserve exact Python/Node Scene bytes and Rust SVG/raster/browser symbol codes, clipping, legend swatches, and implicit line-only stroke behavior
• prove public SVG/PNG/PDF equality for the bounded ordinary Cartesian subset
• keep authored scatter stroke/width, custom paths/glyphs, symbol channels, data-driven paint, polar, and LOD fail-closed on compatibility paths

Validation

• release core build and 50 Rust Scene tests
• 190 focused Python/ABI tests
• full Node suite: 197 tests
• full non-NumPy Chromium render smoke
• exact codes 0..18 cross-host fixture and boundary clipping regressions
• Ruff check/format and full pre-commit

Advances #58 and #116 without closing them. No Scene or ABI version change.

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Summary by CodeRabbit

• New Features
  • Expanded static scene exports to support all 19 built-in scatter symbols across SVG, PNG, PDF, raster, and browser-rendered outputs.
  • Generated stem markers now support the full built-in symbol set.
• Bug Fixes
  • Line-based scatter symbols now automatically use the trace color for their stroke when no explicit stroke is provided.
  • Improved clipping, visibility, symbol sizing, and cross-format rendering consistency.
• Documentation
  • Updated export and compatibility documentation to reflect expanded built-in symbol support.

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📝 Walkthrough

Walkthrough

The change expands public Scene support from two scatter symbols to all 19 built-in symbols. Python and Node apply consistent line-symbol stroke defaults. Rust, export consumers, specifications, and cross-host tests validate routing and rendered output.

Changes

Built-in scatter symbol support

Layer / File(s)	Summary
Symbol contracts and public routing python/xyg/_scene_v3.py, spec/design/..., spec/api/export.md	The public Scene subset now accepts all 19 built-in scatter symbols. Compatibility routing still excludes custom marker paths, glyphs, and data-driven symbol channels.
Host stroke defaults and engine checks packages/xy-node/src/scene.js, crates/xyg-engine/src/scene.rs	Python and Node derive default strokes for line-only symbols. Rust tests verify clipping, implicit 1px strokes, and rendering for every supported symbol.
Cross-host export validation packages/xy-node/test/scene.test.mjs, tests/test_scene_export_support.py, tests/test_figure_scene_v3.py, tests/fixtures/figure_scene_v3.json	Tests compare scene bytes and outputs across Python, Node, SVG, PNG, PDF, raster, and browser-painter consumers. They also validate unsupported authored and data-driven styling.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to 0cec1

The PR adds support for additional built-in scatter symbols, but valid symbols with codes 12–18 are still rejected by Scene batch validation, causing affected exports to fail. The validator range must be updated before this change is merge-ready.

Sequence Diagram(s)

sequenceDiagram
  participant PythonScene as Python _scene_v3
  participant NodeScene as Node figureSceneV3
  participant RustScene as Rust Scene
  participant Consumers as Export consumers
  PythonScene->>RustScene: Route built-in scatter symbols
  NodeScene->>RustScene: Emit matching scene bytes
  RustScene->>Consumers: Render SVG, PNG, PDF, and painter output

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 52.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 6 files. (6 skipped: …	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 describes the main change: routing all built-in scatter symbols through Scene exports.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 52.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 6 files. (6 skipped: 6 unsupported.)

✨ Finishing Touches 💡 1

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• Commit unit tests in branch feature/public-scatter-symbols

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Actionable comments posted: 1

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Inline comments:
In `@crates/xyg-engine/src/scene.rs`:
- Around line 10564-10597: Update validate_scene_batch to accept scatter symbol
codes through ScatterSymbol::VerticalLine instead of limiting them to
ScatterSymbol::X, while preserving rejection of higher invalid codes. Extend the
scene decoding test around document.to_raster_commands and
document.to_browser_painter with an assertion that validate_scene_batch accepts
the generated batch containing codes 12 through 18.

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📥 Commits

Reviewing files that changed from the base of the PR and between ef36498 and 0cec1b1.

📒 Files selected for processing (12)

• crates/xyg-engine/src/scene.rs
• packages/xy-node/src/scene.js
• packages/xy-node/test/scene.test.mjs
• python/xyg/_scene_v3.py
• spec/api/export.md
• spec/design-dossier.md
• spec/design/host-parity.md
• spec/design/ownership-audit.md
• spec/design/scene-ir.md
• tests/fixtures/figure_scene_v3.json
• tests/test_figure_scene_v3.py
• tests/test_scene_export_support.py

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[DecisionNerd]

CodeRabbit fix applied

Resolved the exact-head validator finding in f71519df: validate_scene_batch now accepts every built-in scatter symbol through VerticalLine while continuing to reject higher invalid codes. The all-symbol fixture directly exercises validation plus raster and browser consumers.

Validated with the focused Rust regression, strict Clippy, Ruff, and full pre-commit.