feat: add managed SSH execution spaces

Add managed SSH Hosts and projects with signed side-by-side GoodBuddy Agent and OpenCode Runtime installation, Ask and Execute workspace access, a Main-owned model bridge, detached Agent lifecycle, durable ACP output recovery, and project activation UI.

Use protocol v2 with bounded FIFO frames over SSH instead of custom credit, priority, batching, or model-message chunking. Mismatched Host Agents now upgrade automatically, an exactly verified Node runtime is reused on-host, and local Portable builds can embed strictly verified Agent artifacts.

Release note: 新增托管 SSH 远程项目，可自动安装或升级签名 Agent/OpenCode Runtime，并在 SSH 断线后继续 Agent 工作和同步未确认输出。

src/main/agent/bounded-response.ts

@@ -2,29 +2,56 @@ export type BoundedResponseTextOptions = {
   maxBytes: number
   missingBodyMessage?: string
   tooLargeMessage: string
+  truncatedMessage?: string
 }
 
-export async function readBoundedResponseText(
+export class BoundedResponseTooLargeError extends Error {
+  constructor(message: string) {
+    super(message)
+    this.name = 'BoundedResponseTooLargeError'
+  }
+}
+
+export class BoundedResponseTruncatedError extends Error {
+  constructor(message: string) {
+    super(message)
+    this.name = 'BoundedResponseTruncatedError'
+  }
+}
+
+export async function readBoundedResponseBytes(
   response: Response,
   options: BoundedResponseTextOptions
-): Promise<string> {
+): Promise<Uint8Array> {
   const declaredLength = response.headers.get('content-length')
+  let parsedLength: number | undefined
   if (declaredLength !== null) {
-    const parsedLength = Number(declaredLength)
+    parsedLength = Number(declaredLength)
     if (
       !Number.isSafeInteger(parsedLength) ||
       parsedLength < 0 ||
       parsedLength > options.maxBytes
     ) {
       await response.body?.cancel().catch(() => undefined)
-      throw new Error(options.tooLargeMessage)
+      throw new BoundedResponseTooLargeError(
+        options.tooLargeMessage
+      )
     }
   }
   if (!response.body) {
     if (options.missingBodyMessage) {
       throw new Error(options.missingBodyMessage)
     }
-    return ''
+    if (
+      options.truncatedMessage !== undefined &&
+      parsedLength !== undefined &&
+      parsedLength !== 0
+    ) {
+      throw new BoundedResponseTruncatedError(
+        options.truncatedMessage
+      )
+    }
+    return new Uint8Array()
   }
 
   const reader = response.body.getReader()
@@ -40,7 +67,9 @@ export async function readBoundedResponseText(
       }
       total += value.byteLength
       if (total > options.maxBytes) {
-        throw new Error(options.tooLargeMessage)
+        throw new BoundedResponseTooLargeError(
+          options.tooLargeMessage
+        )
       }
       chunks.push(value)
     }
@@ -50,5 +79,24 @@ export async function readBoundedResponseText(
     }
     reader.releaseLock()
   }
-  return Buffer.concat(chunks, total).toString('utf8')
+  if (
+    options.truncatedMessage !== undefined &&
+    parsedLength !== undefined &&
+    response.headers.get('content-encoding') === null &&
+    total !== parsedLength
+  ) {
+    throw new BoundedResponseTruncatedError(
+      options.truncatedMessage
+    )
+  }
+  return Buffer.concat(chunks, total)
+}
+
+export async function readBoundedResponseText(
+  response: Response,
+  options: BoundedResponseTextOptions
+): Promise<string> {
+  return Buffer.from(
+    await readBoundedResponseBytes(response, options)
+  ).toString('utf8')
 }