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/NovelAgentServiceTests.cs

@@ -12,7 +12,7 @@ public class NovelAgentServiceTests : ServiceTestFixture
     private NovelAgentToolset _toolset = null!;
 
     protected override void OnSetUp() =>
-        _toolset = new NovelAgentToolset(Projects, Characters, Arcs, Chapters, Beats, Scenes, Tags, Questions, NullLogger<NovelAgentToolset>.Instance);
+        _toolset = new NovelAgentToolset(Projects, Characters, Arcs, Chapters, Beats, Tags, Questions, NullLogger<NovelAgentToolset>.Instance);
 
     private NovelAgentService BuildAgent(ScriptedModelClient model) => new(
         Db.Context,
@@ -143,7 +143,6 @@ public class NovelAgentServiceTests : ServiceTestFixture
     {
         var projectId = (await Projects.CreateAsync(new CreateProjectRequest("The Salt Road"))).Id;
 
-        // A model that only ever asks for more tools would otherwise loop forever.
         var model = new ScriptedModelClient(
             Enumerable.Repeat<IReadOnlyList<AgentContentBlock>>(
                 [ToolUse("t", "list_characters", new { })], 20).ToList());
@@ -178,7 +177,6 @@ public class NovelAgentServiceTests : ServiceTestFixture
         {
             Assert.That(second.ConversationId, Is.EqualTo(first.ConversationId));
 
-            // The second request replays the earlier turns so the model has the history.
             Assert.That(model.Transcripts[1], Has.Count.EqualTo(3));
             Assert.That(
                 model.Transcripts[1].Select(m => m.Role),
@@ -209,10 +207,6 @@ public class NovelAgentServiceTests : ServiceTestFixture
         new(id, name, JsonSerializer.SerializeToElement(input));
 }
 
-/// <summary>
-/// A model stand-in that returns a fixed script of turns and records every transcript it
-/// was sent, so tests can assert on what the loop actually put in front of the model.
-/// </summary>
 internal class ScriptedModelClient(IReadOnlyList<IReadOnlyList<AgentContentBlock>> script)
     : IAgentModelClient
 {