feat: assemble resource prompts and skills

src/backend/adapter.ts

@@ -1,4 +1,4 @@
-import type { BackendEvent, BackendTurnResult, CommandRecord, RunRecord } from "../common/types.js";
+import type { BackendEvent, BackendTurnResult, CommandRecord, InitialPromptAssembly, RunRecord } from "../common/types.js";
 import { CodexStdioBackendSession, runCodexStdioTurn, type CodexStdioTurnOptions } from "./codex-stdio.js";
 import { backendProfileSpec } from "../common/backend-profiles.js";
 
@@ -15,6 +15,7 @@ export interface BackendAdapterOptions {
   codexHome?: string;
   workspacePath?: string;
   abortSignal?: AbortSignal;
+  initialPrompt?: InitialPromptAssembly;
   onEvent?: (event: BackendEvent) => void | Promise<void>;
   onActiveTurn?: (control: BackendActiveTurnControl) => void | (() => void);
   env?: NodeJS.ProcessEnv;
@@ -59,6 +60,7 @@ export function backendTurnOptions(run: RunRecord, command: CommandRecord, optio
   if (options.codexCommand) turnOptions.command = options.codexCommand;
   if (options.codexArgs) turnOptions.args = options.codexArgs;
   if (options.env) turnOptions.env = options.env;
+  if (options.initialPrompt) turnOptions.initialPrompt = options.initialPrompt;
   if (options.codexHome) turnOptions.codexHome = options.codexHome;
   if (options.abortSignal) turnOptions.abortSignal = options.abortSignal;
   if (options.onEvent) turnOptions.onEvent = options.onEvent;