feat(letsplot): implement tree-phylogenetic

[github-actions]

Implementation: tree-phylogenetic - python/letsplot

Implements the python/letsplot version of tree-phylogenetic.

File: plots/tree-phylogenetic/implementations/python/letsplot.py

Parent Issue: #3070

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): The phylogenetic tree is displayed on a warm off-white background (#FAF8F1). The title and axis labels are rendered in dark text (INK token #1A1A17), with tick labels in soft gray (INK_SOFT #4A4A44), all clearly readable. The tree structure consists of green (#009E73) horizontal and vertical segments showing evolutionary relationships between 9 primate species (Human, Chimpanzee, Gorilla, Orangutan, Gibbon, Macaque, Baboon, Mandrill). Species labels are colored by clade: green for the Hominoidea group, orange (#D55E00) for Orangutan/Gibbon, and blue (#0072B2) for Macaque and Old World monkeys. Branch lengths are proportional to evolutionary distance (0–0.85 substitutions per site). The X-axis shows the scale with tick labels evenly spaced. Grid lines are subtle and vertical-only, appropriate for tree visualization. All text is fully readable with excellent contrast against the light surface.

Dark render (plot-dark.png): The same phylogenetic tree structure is rendered on a warm near-black background (#1A1A17). Title and axis labels are now light-colored (F0EFE8), and tick labels are in light gray (B8B7B0), maintaining perfect readability. All tree segments, nodes, and species label colors are identical to the light render—the green (#009E73), orange (#D55E00), and blue (#0072B2) data colors remain unchanged, confirming theme-adaptive chrome implementation. No dark-on-dark text failures; all labels (title, axis, species, ticks) have sufficient contrast against the dark surface. The tree layout, proportions, and visual hierarchy are preserved. The grid styling adapts appropriately, and the overall composition is equally readable in dark theme.

Score: 93/100

Category	Score	Max
Visual Quality	30	30
Design Excellence	14	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	10	10
Library Mastery	9	10
Total	93	100

Visual Quality (30/30)

• VQ-01: Text Legibility (8/8) - All text explicitly sized (title 24pt, axis 20pt, ticks 16pt); perfectly readable in both themes
• VQ-02: No Overlap (6/6) - No overlapping text; all elements fully readable
• VQ-03: Element Visibility (6/6) - Tree segments, nodes, and labels optimally sized for data density
• VQ-04: Color Accessibility (2/2) - Okabe-Ito palette CVD-safe; good contrast
• VQ-05: Layout & Canvas (4/4) - Perfect layout with 60-70% canvas fill and balanced margins
• VQ-06: Axis Labels & Title (2/2) - Descriptive X-axis label with units
• VQ-07: Palette Compliance (2/2) - First series #009E73; background colors #FAF8F1 (light) / #1A1A17 (dark); theme-adaptive chrome perfect

Design Excellence (14/20)

• DE-01: Aesthetic Sophistication (6/8) - Strong design with thoughtful clade coloring and domain-aware styling; well above defaults but not FiveThirtyEight-level
• DE-02: Visual Refinement (4/6) - Subtle grid and minimal spines; could benefit from more explicit customization
• DE-03: Data Storytelling (4/6) - Visual hierarchy guides viewer; clade coloring adds semantic meaning; could emphasize specific evolutionary insights further

Spec Compliance (15/15)

• SC-01: Plot Type (5/5) - Correct rectangular cladogram with proportional branch lengths
• SC-02: Required Features (4/4) - All spec features: Newick parsing, proportional distances, labels, clade visualization, scale bar
• SC-03: Data Mapping (3/3) - X/Y correctly mapped; tree structure accurate; all data visible
• SC-04: Title & Legend (3/3) - Title format correct; implicit legend through labeling and color

Data Quality (15/15)

• DQ-01: Feature Coverage (6/6) - Shows all phylogenetic tree features: multiple clades, varying branch lengths, nested hierarchies
• DQ-02: Realistic Context (5/5) - Real-world primate evolution scenario; scientifically plausible and neutral
• DQ-03: Appropriate Scale (4/4) - Branch lengths plausible; species relationships factually correct for primates

Code Quality (10/10)

• CQ-01: KISS Structure (3/3) - Linear flow: imports → theme → parser → calculations → plot → save
• CQ-02: Reproducibility (2/2) - Deterministic Newick string; fully reproducible
• CQ-03: Clean Imports (2/2) - All imports used; no unnecessary dependencies
• CQ-04: Code Elegance (2/2) - Appropriate complexity; no over-engineering or fake functionality
• CQ-05: Output & API (1/1) - Correct output: plot-{THEME}.png + plot-{THEME}.html

Library Mastery (9/10)

• LM-01: Idiomatic Usage (5/5) - Expert use of ggplot() API, geoms, theme customization, and aesthetic mappings
• LM-02: Distinctive Features (4/5) - Uses ggsize(), ggsave() with scale, and advanced theme system; leverages letsplot's high-resolution output system

Score Caps Applied

• None - No caps triggered

Strengths

• Perfect visual quality with excellent text legibility and theme adaptation in both light and dark renders
• Correct phylogenetic tree implementation with expert Newick parsing and proportional branch length encoding
• Thoughtful clade-based color encoding that enhances understanding of evolutionary relationships
• Expert-level use of letsplot's grammar of graphics API and theme customization system
• Comprehensive spec compliance with all required features implemented and working correctly
• Real-world, scientifically accurate example data (primate mitochondrial evolution)

Weaknesses

• DE-02: Visual refinement could be enhanced with more explicit grid styling and explicit spine control in theme
• LM-02: Could leverage more advanced letsplot interactive features if expanded to support interactivity
• DE-03: Visual storytelling could be amplified with annotations highlighting a specific evolutionary pattern or clade significance

Issues Found

None - Implementation meets all quality criteria and exceeds review threshold.

AI Feedback for Next Attempt

N/A - Implementation approved on first attempt with excellent quality (93/100).

Verdict: APPROVED