Remove Scenes, group beats by multiple characters; strip comments repo-wide

Drop the Scene entity/grouping in favor of chapters carrying prose directly
and beats belonging to many characters. Add markdown editor + character
multi-select components to the web client. Remove all XML doc and inline
comments across the touched C#/TS/CSS files in favor of self-documenting
names, and record that convention in CLAUDE.md. Add .mcp.json (local MCP
server config, no secrets) and ignore .idea/.

src/Novelly.Api/Chapters/ChapterContracts.cs

@@ -1,7 +1,6 @@
 using Novelly.Api.Beats;
 using Novelly.Api.Common;
 using Novelly.Api.Common.Validation;
-using Novelly.Api.Scenes;
 using Novelly.Api.Tags;
 
 namespace Novelly.Api.Chapters;
@@ -18,15 +17,10 @@ public record ChapterSummaryResponse(
     DraftStatus Status,
     int? TargetWordCount,
     int BeatCount,
-    int SceneCount,
     int WordCount,
     IReadOnlyList<TagResponse> Tags,
     DateTimeOffset UpdatedAt);
 
-/// <summary>
-/// A chapter in full: the outline (a paragraph of summary plus an ordered beat table)
-/// and the prose layer (scenes).
-/// </summary>
 public record ChapterResponse(
     Guid Id,
     Guid ProjectId,
@@ -40,7 +34,8 @@ public record ChapterResponse(
     DraftStatus Status,
     int? TargetWordCount,
     IReadOnlyList<BeatResponse> Beats,
-    IReadOnlyList<SceneResponse> Scenes,
+    string? Prose,
+    int WordCount,
     IReadOnlyList<TagResponse> Tags,
     DateTimeOffset UpdatedAt);
 
@@ -53,6 +48,7 @@ public record CreateChapterRequest(
     string? Notes = null,
     DraftStatus Status = DraftStatus.Planned,
     int? TargetWordCount = null,
+    string? Prose = null,
     IReadOnlyList<string>? Tags = null);
 
 public class CreateChapterRequestValidator : IModelValidator<CreateChapterRequest>
@@ -66,16 +62,12 @@ public class CreateChapterRequestValidator : IModelValidator<CreateChapterReques
         else if (model.Title.Length > 200)
             result.AddError("Title", "'Title' must be 200 characters or fewer.");
 
-        ChapterValidation.OptionalFields(model.Number, model.Summary, model.Setting, model.Notes, model.TargetWordCount, model.Tags, result);
+        ChapterValidation.OptionalFields(model.Number, model.Summary, model.Setting, model.Notes, model.TargetWordCount, model.Prose, model.Tags, result);
 
         return result;
     }
 }
 
-/// <summary>
-/// Patch-style update. A null field is left alone; an empty string clears it. Passing a
-/// <see cref="Tags"/> list replaces the chapter's tags outright.
-/// </summary>
 public record UpdateChapterRequest(
     string? Title = null,
     int? Number = null,
@@ -85,6 +77,7 @@ public record UpdateChapterRequest(
     string? Notes = null,
     DraftStatus? Status = null,
     int? TargetWordCount = null,
+    string? Prose = null,
     IReadOnlyList<string>? Tags = null);
 
 public class UpdateChapterRequestValidator : IModelValidator<UpdateChapterRequest>
@@ -101,7 +94,7 @@ public class UpdateChapterRequestValidator : IModelValidator<UpdateChapterReques
                 result.AddError("Title", "'Title' must be 200 characters or fewer.");
         }
 
-        ChapterValidation.OptionalFields(model.Number, model.Summary, model.Setting, model.Notes, model.TargetWordCount, model.Tags, result);
+        ChapterValidation.OptionalFields(model.Number, model.Summary, model.Setting, model.Notes, model.TargetWordCount, model.Prose, model.Tags, result);
 
         return result;
     }
@@ -110,7 +103,8 @@ public class UpdateChapterRequestValidator : IModelValidator<UpdateChapterReques
 file static class ChapterValidation
 {
     public static void OptionalFields(
-        int? number, string? summary, string? setting, string? notes, int? targetWordCount, IReadOnlyList<string>? tags, ValidationResult result)
+        int? number, string? summary, string? setting, string? notes, int? targetWordCount, string? prose,
+        IReadOnlyList<string>? tags, ValidationResult result)
     {
         if (number is <= 0)
             result.AddError("Number", "'Number' must be greater than zero.");
@@ -127,6 +121,9 @@ file static class ChapterValidation
         if (targetWordCount is < 0)
             result.AddError("TargetWordCount", "'Target Word Count' must be zero or greater.");
 
+        if (prose is { Length: > 200000 })
+            result.AddError("Prose", "'Prose' must be 200,000 characters or fewer.");
+
         if (tags is not null && tags.Any(string.IsNullOrWhiteSpace))
             result.AddError("Tags", "'Tags' must not contain blank entries.");
     }
@@ -139,14 +136,19 @@ public static class ChapterMapping
         c.PovCharacterId, c.PovCharacter?.Name, c.Setting, c.Notes,
         c.Status, c.TargetWordCount,
         [.. c.Beats.OrderBy(b => b.SortOrder).Select(b => b.ToResponse())],
-        [.. c.Scenes.OrderBy(s => s.SortOrder).Select(s => s.ToResponse())],
+        c.Prose, c.WordCount,
         [.. c.Tags.OrderBy(t => t.Name).Select(t => t.ToResponse())],
         c.UpdatedAt);
 
     public static ChapterSummaryResponse ToSummaryResponse(this Chapter c) => new(
         c.Id, c.ProjectId, c.Number, c.Title, c.Summary,
         c.PovCharacterId, c.PovCharacter?.Name, c.Setting, c.Status, c.TargetWordCount,
-        c.Beats.Count, c.Scenes.Count, c.Scenes.Sum(s => s.WordCount),
+        c.Beats.Count, c.WordCount,
         [.. c.Tags.OrderBy(t => t.Name).Select(t => t.ToResponse())],
         c.UpdatedAt);
+
+    public static int CountWords(string? prose) =>
+        string.IsNullOrWhiteSpace(prose)
+            ? 0
+            : prose.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries).Length;
 }