fix: update bundled DeepSeek Harness to rc.8

The desktop runtime still pinned the rc.6 Harness family. It now uses the coherent rc.8 package set, adapts the revised image-attachment limits and error contract, and derives release checks from the lockfile. The managed SSH Agent package remains unchanged.

Release note: 内置 DeepSeek Harness 已升级至 0.1.0-rc.8，并适配新版图片附件限制；托管 SSH Agent 包不受影响。

src/main/agent/goodbuddy-harness-control-plane.ts

@@ -13,6 +13,7 @@ import type { Context } from '@deepseek-ai/cordis'
 import type { AgentHandle } from '@deepseek-ai/dsh-agent'
 import {
   AttachmentError,
+  isImageAdmissionError,
   type ImageAttachmentRef,
   type SaveImageAttachment
 } from '@deepseek-ai/dsh-attachment'
@@ -1059,16 +1060,13 @@ export class GoodBuddyHarnessControlPlane {
       return await store.saveImages(inputs)
     } catch (error) {
       if (error instanceof AttachmentError) {
-        if (error.code === 'INVALID_IMAGE') {
+        if (isImageAdmissionError(error)) {
           throw RequestError.invalidParams(
             undefined,
             'invalid inline image prompt content'
           )
         }
-        if (
-          error.code === 'STORAGE_LIMIT' ||
-          error.code === 'DECODER_UNAVAILABLE'
-        ) {
+        if (error.code === 'ATTACHMENT_WRITE_FAILED') {
           throw RequestError.internalError(
             undefined,
             'Harness image attachment service is unavailable'