fix(hooks): shared spawn-bin helper — all three AskUserQuestion hooks were inert on Windows

The plan-tune hooks resolved bin scripts via new URL(import.meta.url).pathname
(which doubles the drive letter on Windows: /C:/C:/...) and spawnSync'd
extensionless bash scripts directly (unrunnable without a shell association)
— so question logging, preferences, and the error fallback all silently
no-op'd on Windows, and /plan-tune collected no data. A single spawn-bin.ts
helper now owns bin resolution (fileURLToPath) and win32 bash routing for
every hook, with static tripwires so a future hook can't reintroduce the
raw pattern. This is the one Windows-spawn idiom for hook code.

Fixes #2356.

Contributed by @rafassousa (PR #2504; supersedes PR #2399 by @chuchu2781).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

hosts/claude/hooks/question-log-hook.ts

@@ -36,7 +36,7 @@ import * as crypto from 'crypto';
 import * as fs from 'fs';
 import * as path from 'path';
 import * as os from 'os';
-import { spawnSync } from 'child_process';
+import { runBin } from './spawn-bin';
 
 interface HookStdin {
   session_id?: string;
@@ -250,12 +250,7 @@ function detectSkill(cwd: string | undefined): string {
 }
 
 function spawnLog(payload: Record<string, unknown>, cwd?: string): void {
-  // Locate the bin relative to this script's directory.
-  const here = path.dirname(new URL(import.meta.url).pathname);
-  // hosts/claude/hooks/ -> ../../../bin/
-  const repoRoot = path.resolve(here, '..', '..', '..');
-  const bin = path.join(repoRoot, 'bin', 'gstack-question-log');
-  const res = spawnSync(bin, [JSON.stringify(payload)], {
+  const res = runBin('gstack-question-log', [JSON.stringify(payload)], {
     encoding: 'utf-8',
     stdio: ['ignore', 'pipe', 'pipe'],
     timeout: 3000,