fix(coding-agent/task): skipped context file for IRC-enabled subagents

- Skipped writing compact conversation context files when IRC is enabled so subagents avoid using stale markdown snapshots.
- In runSubprocess, passed an undefined context file for IRC-enabled paths and kept context file prompting for non-IRC executions.

packages/coding-agent/src/task/executor.ts

@@ -563,6 +563,7 @@ export async function runSubprocess(options: ExecutorOptions): Promise<SingleRes
 
 	const lspEnabled = enableLsp ?? true;
 	const ircEnabled = subagentSettings.get("irc.enabled") === true;
+	const contextFileForPrompt = ircEnabled ? undefined : options.contextFile;
 	const skipPythonPreflight = Array.isArray(toolNames) && !toolNames.includes("eval");
 
 	const outputChunks: string[] = [];
@@ -1001,7 +1002,7 @@ export async function runSubprocess(options: ExecutorOptions): Promise<SingleRes
 						context: options.context?.trim() ?? "",
 						worktree: worktree ?? "",
 						outputSchema: normalizedOutputSchema,
-						contextFile: options.contextFile,
+						contextFile: contextFileForPrompt,
 						ircPeers: ircEnabled ? renderIrcPeerRoster(id) : "",
 						ircSelfId: ircEnabled ? id : "",
 					});