Discord: thread bindings idle + max-age lifecycle (#27845) (thanks @osolmaz)

* refactor discord thread bindings to idle and max-age lifecycle

* fix: migrate legacy thread binding expiry and reduce hot-path disk writes

* refactor: remove remaining thread-binding ttl legacy paths

* fix: harden thread-binding lifecycle persistence

* Discord: fix thread binding types in message/reply paths

* Infra: handle win32 unknown inode in file identity checks

* Infra: relax win32 guarded-open identity checks

* Config: migrate threadBindings ttlHours to idleHours

* Revert "Infra: relax win32 guarded-open identity checks"

This reverts commit de94126771.

* Revert "Infra: handle win32 unknown inode in file identity checks"

This reverts commit 96fc5ddfb3.

* Discord: re-read live binding state before sweep unbind

* fix: add changelog note for thread binding lifecycle update (#27845) (thanks @osolmaz)

---------

Co-authored-by: Onur Solmaz <onur@textcortex.com>

src/config/types.base.ts

@@ -91,10 +91,15 @@ export type SessionThreadBindingsConfig = {
    */
   enabled?: boolean;
   /**
-   * Auto-unfocus TTL for thread-bound sessions (hours).
-   * Set to 0 to disable. Default: 24.
+   * Inactivity window for thread-bound sessions (hours).
+   * Session auto-unfocuses after this amount of idle time. Set to 0 to disable. Default: 24.
    */
-  ttlHours?: number;
+  idleHours?: number;
+  /**
+   * Optional hard max age for thread-bound sessions (hours).
+   * Session auto-unfocuses once this age is reached even if active. Set to 0 to disable. Default: 0.
+   */
+  maxAgeHours?: number;
 };
 
 export type SessionConfig = {