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/.

tests/Novelly.Api.Tests/CapturingLogger.cs

@@ -2,14 +2,8 @@ using Microsoft.Extensions.Logging;
 
 namespace Novelly.Api.Tests;
 
-/// <summary>Records every entry logged through it, so tests can assert on what a service logged.</summary>
 public record CapturedLogEntry(LogLevel Level, string Message, Exception? Exception);
 
-/// <summary>
-/// A test double for <see cref="ILogger{TCategoryName}"/> that captures entries instead of
-/// writing them anywhere, so tests can assert a service logged at the right level with the
-/// right values without standing up a real sink.
-/// </summary>
 public class CapturingLogger<T> : ILogger<T>
 {
     public List<CapturedLogEntry> Entries { get; } = [];