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/agents/acp-spawn.ts

@@ -17,7 +17,8 @@ import {
 import {
   formatThreadBindingDisabledError,
   formatThreadBindingSpawnDisabledError,
-  resolveThreadBindingSessionTtlMsForChannel,
+  resolveThreadBindingIdleTimeoutMsForChannel,
+  resolveThreadBindingMaxAgeMsForChannel,
   resolveThreadBindingSpawnPolicy,
 } from "../channels/thread-bindings-policy.js";
 import { loadConfig } from "../config/config.js";
@@ -329,7 +330,12 @@ export async function spawnAcpDirect(
           introText: resolveThreadBindingIntroText({
             agentId: targetAgentId,
             label: params.label || undefined,
-            sessionTtlMs: resolveThreadBindingSessionTtlMsForChannel({
+            idleTimeoutMs: resolveThreadBindingIdleTimeoutMsForChannel({
+              cfg,
+              channel: preparedBinding.channel,
+              accountId: preparedBinding.accountId,
+            }),
+            maxAgeMs: resolveThreadBindingMaxAgeMsForChannel({
               cfg,
               channel: preparedBinding.channel,
               accountId: preparedBinding.accountId,