feat(pygal): implement bar-sorted (#2582)

## Implementation: `bar-sorted` - pygal

Implements the **pygal** version of `bar-sorted`.

**File:** `plots/bar-sorted/implementations/pygal.py`

---
:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/pyplots/actions/runs/20593352116)*

---------

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

plots/bar-sorted/implementations/pygal.py

@@ -0,0 +1,62 @@
+""" pyplots.ai
+bar-sorted: Sorted Bar Chart
+Library: pygal 3.1.0 | Python 3.13.11
+Quality: 91/100 | Created: 2025-12-30
+"""
+
+import pygal
+from pygal.style import Style
+
+
+# Data - Monthly sales by product category (already sorted descending)
+categories = ["Electronics", "Clothing", "Home & Garden", "Sports", "Books", "Toys", "Beauty", "Food"]
+values = [4850, 3720, 2980, 2450, 1890, 1560, 1240, 980]
+
+# Reverse for pygal HorizontalBar (renders bottom-to-top, so largest should be last)
+categories_reversed = list(reversed(categories))
+values_reversed = list(reversed(values))
+
+# Custom style for 4800x2700 canvas with increased font sizes
+custom_style = Style(
+    background="white",
+    plot_background="white",
+    foreground="#333333",
+    foreground_strong="#333333",
+    foreground_subtle="#999999",  # Lighter color for grid lines
+    colors=("#306998",),  # Python Blue for all bars
+    title_font_size=84,
+    label_font_size=56,
+    major_label_font_size=50,
+    legend_font_size=50,
+    value_font_size=44,
+    value_label_font_size=44,
+    tooltip_font_size=44,
+    stroke_width=2,
+)
+
+# Create horizontal bar chart (better for category labels)
+chart = pygal.HorizontalBar(
+    width=4800,
+    height=2700,
+    style=custom_style,
+    title="bar-sorted · pygal · pyplots.ai",
+    x_title="Sales (USD)",
+    show_legend=False,
+    show_x_guides=True,
+    print_values=True,
+    print_values_position="center",
+    value_formatter=lambda x: f"${x:,.0f}",
+    margin=80,
+    spacing=30,
+    truncate_label=-1,
+)
+
+# Set category labels on Y-axis (x_labels maps to Y-axis in HorizontalBar)
+chart.x_labels = categories_reversed
+
+# Add data as single series (no legend needed since x_labels provide categories)
+chart.add("Sales", values_reversed)
+
+# Save as PNG and HTML
+chart.render_to_png("plot.png")
+chart.render_to_file("plot.html")

plots/bar-sorted/metadata/pygal.yaml

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+library: pygal
+specification_id: bar-sorted
+created: '2025-12-30T09:32:30Z'
+updated: '2025-12-30T10:01:42Z'
+generated_by: claude-opus-4-5-20251101
+workflow_run: 20593352116
+issue: 0
+python_version: 3.13.11
+library_version: 3.1.0
+preview_url: https://storage.googleapis.com/pyplots-images/plots/bar-sorted/pygal/plot.png
+preview_thumb: https://storage.googleapis.com/pyplots-images/plots/bar-sorted/pygal/plot_thumb.png
+preview_html: https://storage.googleapis.com/pyplots-images/plots/bar-sorted/pygal/plot.html
+quality_score: 91
+review:
+  strengths:
+  - Excellent sorting implementation with proper reversal for pygal bottom-to-top
+    rendering
+  - Clean, readable code structure following KISS principles
+  - Good use of pygal custom Style for consistent theming at high resolution
+  - Value labels centered in bars with proper currency formatting
+  - Horizontal orientation is ideal for category labels as noted in spec
+  - Appropriate font sizes scaled for 4800x2700 canvas
+  weaknesses:
+  - Missing y-axis title to label the categories dimension
+  - Data values could show more variation to better demonstrate sorting benefit