feat(codex-link): AITURK work routing setting and beta.40

- Default routing rule (user decision, 15 Oct 2026): repeating/scheduled work goes to the AITURK IDE bot as a cron job; coding stays in Codex (itself or its subagents); 'Codex' or 'sen yap' keeps everything in Codex.
- Settings > Codex Bağlama: choice (recommended / send large work / never / custom text) with a text box and restore-default; written to bridge.json aiturk_hat.
- Bridge re-reads aiturk_hat when bridge.json changes: no restart. IDE apply keeps aiturk_hat instead of wiping it.
- Bridge version 20, IDE 1.0.0-beta.40. Jev untouched.

apps/desktop/electron/is-hatti-settings.ts

@@ -0,0 +1,82 @@
+import fs from 'node:fs'
+import path from 'node:path'
+
+/** "AITURK iş hattı" choice, stored in the Codex bridge's `bridge.json` under `aiturk_hat`.
+ *  The bridge re-reads the field when the file changes, so no restart is needed. */
+export type IsHattiSecim = 'onerilen' | 'buyuk' | 'kapali' | 'ozel'
+
+export interface IsHattiSettings {
+  secim: IsHattiSecim
+  talimat: string
+}
+
+const SECIMLER: IsHattiSecim[] = ['onerilen', 'buyuk', 'kapali', 'ozel']
+const MAX_TALIMAT = 20000
+
+export function readIsHatti(raw: null | string): IsHattiSettings {
+  try {
+    const hat = raw ? JSON.parse(raw)?.aiturk_hat : null
+
+    if (!hat || typeof hat !== 'object') {
+      return { secim: 'onerilen', talimat: '' }
+    }
+
+    const talimat = typeof hat.talimat === 'string' ? hat.talimat : ''
+
+    if (SECIMLER.includes(hat.secim)) {
+      return { secim: hat.secim, talimat }
+    }
+
+    // Written before this screen existed: same meaning the bridge gives it.
+    return { secim: hat.enabled === false ? 'kapali' : talimat.trim() ? 'ozel' : 'onerilen', talimat }
+  } catch {
+    return { secim: 'onerilen', talimat: '' }
+  }
+}
+
+export function writeIsHatti(raw: null | string, value: unknown): string {
+  const v = value as Partial<IsHattiSettings> | null
+
+  if (!v || !SECIMLER.includes(v.secim as IsHattiSecim)) throw new Error('Invalid choice')
+  const talimat = typeof v.talimat === 'string' ? v.talimat : ''
+
+  if (talimat.length > MAX_TALIMAT) throw new Error('Instruction too long')
+  if (v.secim === 'ozel' && !talimat.trim()) throw new Error('Custom instruction is empty')
+  let config: Record<string, unknown> = {}
+
+  try {
+    const parsed = raw ? JSON.parse(raw) : {}
+    config = parsed && typeof parsed === 'object' && !Array.isArray(parsed) ? parsed : {}
+  } catch {
+    throw new Error('bridge.json is not valid JSON')
+  }
+
+  const old = config.aiturk_hat && typeof config.aiturk_hat === 'object' ? (config.aiturk_hat as Record<string, unknown>) : {}
+  const hat: Record<string, unknown> = { ...old, secim: v.secim, talimat }
+  delete hat.enabled
+
+  return `${JSON.stringify({ ...config, aiturk_hat: hat }, null, 2)}\n`
+}
+
+export function createIsHattiStore(directory: string) {
+  const file = path.join(directory, 'bridge.json')
+  const read = () => (fs.existsSync(file) ? fs.readFileSync(file, 'utf8') : null)
+
+  return {
+    get: (): IsHattiSettings => readIsHatti(read()),
+    save(value: unknown): IsHattiSettings {
+      const text = writeIsHatti(read(), value)
+      fs.mkdirSync(directory, { recursive: true })
+      const tmp = `${file}.${process.pid}.tmp`
+
+      try {
+        fs.writeFileSync(tmp, text, 'utf8')
+        fs.renameSync(tmp, file)
+      } finally {
+        if (fs.existsSync(tmp)) fs.unlinkSync(tmp)
+      }
+
+      return readIsHatti(text)
+    }
+  }
+}