fix(sandbox-adapter): stop waiting on aborted Daytona exec

[eersnington]

The Sandbox.exec contract says an abort rejects with Error("aborted"). Daytona's executeCommand takes no signal, so a Stop during bash: npm test waited for the command. An Actor sleep or upgrade waited too, up to sleepGracePeriod.

 exec: async (command, options) => {
+	if (options.signal?.aborted) throw new Error("aborted");
-	result = await sandbox.process.executeCommand(command, options.cwd, options.env, timeout);
+	result = await untilAborted(
+		sandbox.process.executeCommand(command, options.cwd, options.env, timeout),
+		options.signal,
+	);

• untilAborted rejects with Error("aborted") when the signal fires first, and removes its listener when the call settles.
• Daytona cannot stop the command. Deleting its session does not stop it either. So the command keeps running in the sandbox until it exits or reaches its timeout. Only the wait ends.

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This is part 3 of 9 in a stack:

•  9  docs(agents): type the React example's root id as ConversationId #346
•  8  feat(pi): prefix Pi Durable's tables in actor sqlite #345
•  7  chore(pi): bump and test Pi Durable 1.1.0 #344
•  6  refactor(pi): type action ids with Pi's branded id types #343
•  5  refactor(sandbox-adapter): simplify sandboxEnv #342
•  4  refactor(pi): move databaseEnv into pi and version pi_file #341
•  3  fix(sandbox-adapter): stop waiting on aborted Daytona exec #340 👈
•  2  fix(sandbox-adapter): stop Pi env calls when the run aborts #339
•  1  fix(pi): read an app credential with one source call #338