fix: stop subagent history from exhausting disk space

Repeated full subagent progress snapshots could grow the desktop database to
many gigabytes during ordinary long-running tasks. Local and managed SSH
writes now retain lossless progress changes while preserving conversation
snapshots, event identities, remote replay deduplication and transaction rollback.

Upgrade existing history in bounded worker-thread batches, show progress and
retry controls, and reclaim freed disk space after conversion. Schema 34 cannot
be opened by older clients; a pre-upgrade backup is required for client rollback.
Document reusable database migration guidance and the verified large-database,
portable, local Runtime and Linux Host evidence.

Prepare Desktop 0.13.1 with the approved bilingual notes and aligned feature
lists. Agent remains 0.11.24. Final candidate validation and production builds
will run on main CI, as requested, without additional local release testing.

Release note: 修复长任务和子任务造成的数据库异常膨胀；升级时自动整理旧记录并回收空间，保留聊天、执行详情和结果，并支持退出后继续处理。

FEATURES.md

@@ -21,7 +21,7 @@ otherwise.
   packages target compatible x64 and arm64 environments, including UOS, Kylin,
   Hygon, Zhaoxin, Kunpeng, and Phytium systems. This is not vendor certification.
   LoongArch has a separate experimental loong64 preview outside standard
-  releases and automatic updates; no preview is planned for 0.13.0. See the
+  releases and automatic updates; no preview is planned for 0.13.1. See the
   [preview boundaries](./docs/development/loongarch-preview-build.md).
 - [x] **Configurable global shortcut**: Enable, disable, or record an Electron
   accelerator under Platform Features / General. The default remains
@@ -111,6 +111,14 @@ otherwise.
 
 ### Agent Runtimes and model connections
 
+- [x] **Compact subagent history without lost details**: Local and managed SSH
+  subagent events store changes instead of repeated full progress snapshots.
+  The first upgrade automatically converts existing history and reclaims disk
+  space, with visible progress and quit/retry support. Chats, execution details,
+  results, and remote event deduplication are preserved; older clients cannot
+  reopen the upgraded database. See
+  [storage and upgrade behavior](./docs/features/assistant-workbar/execution-history-storage.md).
+
 - [x] **Direct model Runtime**: Supports question answering, knowledge
   synthesis, controlled tool execution, image generation, and reference-image
   editing through providers supporting the OpenAI-compatible image-editing
@@ -215,7 +223,7 @@ otherwise.
   failure, Agent `SIGKILL`/restart, and recovery from a reopened Desktop SQLite
   database. Successful tool START/END events appear exactly once, with no
   Prompt, provider, or tool replay observed. The current Agent source lock is
-  `0.11.24`, while the current Desktop release candidate is `0.13.0`; formal
+  `0.11.24`, while the current Desktop release candidate is `0.13.1`; formal
   publication status follows the separate Agent and Desktop
   release channels. Previous macOS validation covered native package installation,
   detached lifecycle, Attach, real Ask/Execute, and cancellation of tools in
@@ -668,7 +676,7 @@ otherwise.
 
 ### Open source, builds, and releases
 
-- Current source candidates are Desktop `0.13.0` and Agent `0.11.24`, with
+- Current source candidates are Desktop `0.13.1` and Agent `0.11.24`, with
   OpenCode pinned to `1.18.29`. Publication status follows the independent
   Desktop and Agent release channels.
 - Candidate acceptance remains separate from version preparation. The current