rename: ApplyContext → Scenario$ in generated types and docs

Agent-Logs-Url: https://github.com/counterfact/api-simulator/sessions/3b3f523f-aaf7-4acd-bf29-0cca1b1b16e7

Author: Copilot

docs/features/repl.md

@@ -98,7 +98,7 @@ After the command runs you can immediately use anything stored in `$.routes`:
 ⬣> routes.findSold.send()
 ```
 
-The `Scenario` type and `ApplyContext` interface are generated automatically into `types/_.context.ts` when you run Counterfact with type generation enabled.
+The `Scenario` type and `Scenario$` interface are generated automatically into `types/_.context.ts` when you run Counterfact with type generation enabled.
 
 ## See also
 

src/typescript-generator/generate.ts

@@ -277,7 +277,7 @@ function buildApplyContextContent(contextFiles: ContextFileInfo[]): string {
     "  loadContext(path: string): Record<string, unknown>;",
     "}",
     "",
-    "export interface ApplyContext {",
+    "export interface Scenario$ {",
     '  /** Root context, same as loadContext("/") */',
     `  readonly context: ${contextType};`,
     '  readonly loadContext: LoadContextDefinitions["loadContext"];',
@@ -288,7 +288,7 @@ function buildApplyContextContent(contextFiles: ContextFileInfo[]): string {
     "}",
     "",
     "/** A scenario function that receives the live REPL environment */",
-    "export type Scenario = ($: ApplyContext) => Promise<void> | void;",
+    "export type Scenario = ($: Scenario$) => Promise<void> | void;",
     "",
     "/** Interface for Context objects defined in _.context.ts files */",
     "export interface Context$ {",
@@ -304,8 +304,8 @@ function buildApplyContextContent(contextFiles: ContextFileInfo[]): string {
 }
 
 /**
- * Writes the `types/scenario-context.ts` file, which exports the
- * `ApplyContext` interface used to type scenario functions.
+ * Writes the `types/_.context.ts` file, which exports the
+ * `Scenario$` interface used to type scenario functions.
  *
  * The interface is generated from all `_.context.ts` files found under the
  * `routes/` directory, providing strongly typed `loadContext()` overloads for

test/typescript-generator/generate.test.ts

@@ -78,7 +78,7 @@ describe("_.context type generation", () => {
       );
       expect(content).not.toContain("import type");
       expect(content).toContain(
-        "export type Scenario = ($: ApplyContext) => Promise<void> | void;",
+        "export type Scenario = ($: Scenario$) => Promise<void> | void;",
       );
       expect(content).toContain("export interface Context$ {");
       expect(content).toContain(