feat(api): named BeckStyles shortcuts and record render options

README.md

@@ -202,7 +202,7 @@ using Beck;
 using Beck.Rendering;
 
 // Site-wide default (a document's own meta.style overrides it):
-string svg = BeckSvg.Render(yaml, new SvgRenderOptions { Style = BeckStyles.ByName["glow"] });
+string svg = BeckSvg.Render(yaml, new SvgRenderOptions { Style = BeckStyles.Glow });
 ```
 
 Precedence runs `meta.style` (YAML) → `SvgRenderOptions.Style` (C# default) → `classic` — the C#

src/Beck/BeckStyles.cs

@@ -3,8 +3,9 @@
 namespace Beck;
 
 /// <summary>
-/// The registry of built-in <see cref="BeckStyle"/>s, keyed by their YAML <c>meta.style</c> token.
-/// Phase 2 ships only <see cref="BeckStyle.Classic"/>; Phase 3/4 append the designed styles.
+/// The registry of built-in <see cref="BeckStyle"/>s, keyed by their YAML <c>meta.style</c> token,
+/// with a static shortcut per style for C# callers (<c>BeckStyles.Glow</c> reads better than
+/// <c>BeckStyles.ByName["glow"]</c> and survives a rename).
 /// </summary>
 /// <remarks>
 /// A <c>meta.style</c> token (and a custom style's <see cref="BeckStyle.Name"/>) must match
@@ -14,8 +15,35 @@ namespace Beck;
 /// </remarks>
 public static class BeckStyles
 {
+    /// <summary>The <c>classic</c> default style; alias of <see cref="BeckStyle.Classic"/>.</summary>
+    public static BeckStyle Classic => BeckStyle.Classic;
+
+    /// <summary>The <c>minimal</c> built-in style (<see cref="Styles.MinimalStyle"/>).</summary>
+    public static BeckStyle Minimal => MinimalStyle.Instance;
+
+    /// <summary>The <c>terminal</c> built-in style (<see cref="Styles.TerminalStyle"/>).</summary>
+    public static BeckStyle Terminal => TerminalStyle.Instance;
+
+    /// <summary>The <c>blueprint</c> built-in style (<see cref="Styles.BlueprintStyle"/>).</summary>
+    public static BeckStyle Blueprint => BlueprintStyle.Instance;
+
+    /// <summary>The <c>glow</c> built-in style (<see cref="Styles.GlowStyle"/>).</summary>
+    public static BeckStyle Glow => GlowStyle.Instance;
+
+    /// <summary>The <c>brutalist</c> built-in style (<see cref="Styles.BrutalistStyle"/>).</summary>
+    public static BeckStyle Brutalist => BrutalistStyle.Instance;
+
+    /// <summary>The <c>sketch</c> built-in style (<see cref="Styles.SketchStyle"/>).</summary>
+    public static BeckStyle Sketch => SketchStyle.Instance;
+
+    /// <summary>The <c>extrude</c> built-in style (<see cref="Styles.ExtrudeStyle"/>).</summary>
+    public static BeckStyle Extrude => ExtrudeStyle.Instance;
+
+    /// <summary>The <c>circuit</c> built-in style (<see cref="Styles.CircuitStyle"/>).</summary>
+    public static BeckStyle Circuit => CircuitStyle.Instance;
+
     /// <summary>All built-in styles, in declaration order.</summary>
-    public static IReadOnlyList<BeckStyle> All { get; } = [BeckStyle.Classic, MinimalStyle.Instance, TerminalStyle.Instance, BlueprintStyle.Instance, GlowStyle.Instance, BrutalistStyle.Instance, SketchStyle.Instance, ExtrudeStyle.Instance, CircuitStyle.Instance,
+    public static IReadOnlyList<BeckStyle> All { get; } = [Classic, Minimal, Terminal, Blueprint, Glow, Brutalist, Sketch, Extrude, Circuit,
     ];
 
     /// <summary>Built-in styles keyed by <see cref="BeckStyle.Name"/> (ordinal, case-sensitive).</summary>

src/Beck/README.md

@@ -52,7 +52,7 @@ and flips with light and dark. Select one per document with `meta: { style: sket
 site-wide default from C#:
 
 ```csharp
-string svg = BeckSvg.Render(yaml, new SvgRenderOptions { Style = BeckStyles.ByName["glow"] });
+string svg = BeckSvg.Render(yaml, new SvgRenderOptions { Style = BeckStyles.Glow });
 ```
 
 Precedence runs `meta.style` → `SvgRenderOptions.Style` → `classic`. Every built-in is an instance of

src/Beck/SvgRenderOptions.cs

@@ -75,8 +75,12 @@ public enum TextLengthGuard
     Off,
 }
 
-/// <summary>Options controlling a <see cref="BeckSvg.Render(string, SvgRenderOptions?)"/> call.</summary>
-public sealed class SvgRenderOptions
+/// <summary>
+/// Options controlling a <see cref="BeckSvg.Render(string, SvgRenderOptions?)"/> call. A record, so
+/// a host can derive from a base configuration with a <c>with</c> expression — the properties are
+/// init-only.
+/// </summary>
+public sealed record SvgRenderOptions
 {
     /// <summary>Text measurer; defaults to the embedded Inter metrics table.</summary>
     public ITextMeasurer Measurer { get; init; } = InterMetricsMeasurer.Instance;