revert: back out experimental codemode (#35077)

packages/codemode/src/tool-error.ts

@@ -1,11 +0,0 @@
-import { Schema } from "effect"
-
-/** Safe operational refusal from a standard tool pack, reported as `ToolFailure`. */
-export class ToolError extends Schema.TaggedErrorClass<ToolError>()("ToolError", {
-  message: Schema.String,
-  cause: Schema.optionalKey(Schema.Defect()),
-}) {}
-
-/** Creates a tool refusal whose message is safe to include in an execution diagnostic. */
-export const toolError = (message: string, cause?: unknown): ToolError =>
-  new ToolError({ message, ...(cause === undefined ? {} : { cause }) })