feat: add independent managed SSH agent packages

Managed SSH previously tied remote Agent and Runtime artifacts to desktop
packaging and Host activation. Settings now manages verified Linux x64 and
arm64 .gbagent packages explicitly, with source-aligned download and update
plus offline import and export. Each package contains the signed Agent, pinned
Node, and compatible OpenCode Runtime, and project activation never downloads
one automatically.

Dedicated native CI and a protected release workflow publish deterministic,
signed cumulative catalogs to GitHub and Beijing OSS without replacing the
desktop Latest release. Desktop packaging is metadata-only, remains independent
of Agent artifacts and signing credentials, and Linux desktop releases add RPM
installers.

The managed SSH path also keeps model credentials in Main, enforces Ask as
read-only, verifies signed Agent and Runtime inputs, preserves ACP recovery, and
reports Host update cancellation and failures accurately.

Release note: 远程项目现可在“设置”中手动下载、更新或离线导入签名 Agent 包，桌面安装包与远程组件发布相互独立；Linux 桌面版同时新增 RPM 安装包。

src/agent-daemon/model-bridge-helper.ts

@@ -1,4 +1,4 @@
-import { randomUUID } from 'node:crypto'
+import { randomBytes, randomUUID } from 'node:crypto'
 import { spawn as nodeSpawn } from 'node:child_process'
 import {
   createServer,
@@ -37,12 +37,18 @@ export type ModelBridgeProtocol = ModelBridgeModelProtocol
 // The Anthropic and OpenAI SDK adapters refuse to issue a request without an
 // apiKey option. This fixed value is only a local compatibility marker. The
 // loopback proxy verifies and removes its header before creating the wire
-// request, so it is neither a credential nor visible outside the sandbox.
+// request. A separate per-helper random route capability authenticates local
+// requests, so this marker is neither a credential nor visible upstream.
 export const MODEL_BRIDGE_SDK_AUTH_SENTINEL =
   'goodbuddy-local-model-bridge-v1'
 
 export type OpenCodeModelBridgeProviderConfig = {
   model: string
+  agent: {
+    title: {
+      disable: true
+    }
+  }
   provider: Record<
     string,
     {
@@ -100,6 +106,7 @@ const DEFAULT_REQUEST_TIMEOUT_MS = 180_000
 const RESPONSE_CLOSE_TIMEOUT_MS = 2_000
 const MAXIMUM_HTTP_HEADER_BYTES = 16 * 1024
 const MAXIMUM_HTTP_HEADER_COUNT = 32
+const MODEL_BRIDGE_ROUTE_TOKEN_PATTERN = /^[A-Za-z0-9_-]{43}$/u
 const CREDENTIAL_INBOUND_HEADER_NAMES = new Set([
   'api-key',
   'authorization',
@@ -116,6 +123,7 @@ const FORWARDED_HEADER_NAMES = [
 
 export class ModelBridgeLoopbackProxy {
   readonly #exchange: ModelBridgeExchange
+  readonly #routeToken: string
   readonly #maximumConnections: number
   readonly #requestTimeoutMs: number
   readonly #sockets = new Set<Socket>()
@@ -128,10 +136,15 @@ export class ModelBridgeLoopbackProxy {
 
   constructor(options: {
     exchange: ModelBridgeExchange
+    routeToken?: string
     maximumConnections?: number
     requestTimeoutMs?: number
   }) {
     this.#exchange = options.exchange
+    this.#routeToken = parseModelBridgeRouteToken(
+      options.routeToken ??
+        randomBytes(32).toString('base64url')
+    )
     this.#maximumConnections = boundedInteger(
       options.maximumConnections ?? DEFAULT_MAXIMUM_CONNECTIONS,
       1,
@@ -195,7 +208,8 @@ export class ModelBridgeLoopbackProxy {
           'Model bridge loopback address is unavailable'
         )
       }
-      this.#origin = `http://${LOOPBACK_HOST}:${address.port}`
+      this.#origin =
+        `http://${LOOPBACK_HOST}:${address.port}/${this.#routeToken}`
       return this.#origin
     } catch (error) {
       await this.close()
@@ -280,7 +294,10 @@ export class ModelBridgeLoopbackProxy {
     timeout.unref?.()
 
     try {
-      const request = await parseHttpRequest(incoming)
+      const request = await parseHttpRequest(
+        incoming,
+        this.#routeToken
+      )
       await this.#acquireDispatch(cancellation.signal)
       dispatchHeld = true
       dispatched = normalizeExchangeResult(
@@ -483,6 +500,14 @@ export function createOpenCodeModelBridgeProviderConfig(input: {
   const baseURL = `${origin}/v1`
   return {
     model: `${providerId}/${model}`,
+    // GoodBuddy owns conversation titles. A first-prompt title request can
+    // race the real ACP prompt, abandon its Provider response, and correctly
+    // poison the no-replay ledger before the user request can run.
+    agent: {
+      title: {
+        disable: true
+      }
+    },
     provider: {
       [providerId]: {
         name,
@@ -513,12 +538,15 @@ export function createOpenCodeModelBridgeProviderConfig(input: {
 }
 
 async function parseHttpRequest(
-  incoming: IncomingMessage
+  incoming: IncomingMessage,
+  routeToken: string
 ): Promise<RemoteModelGatewayRequest> {
   if (incoming.method !== 'POST') {
     throw new HttpRequestError(405, 'method-not-allowed')
   }
-  const path = remoteModelApiPathSchema.safeParse(incoming.url)
+  const path = remoteModelApiPathSchema.safeParse(
+    authenticatedApiPath(incoming.url, routeToken)
+  )
   if (!path.success) {
     throw new HttpRequestError(404, 'path-not-allowed')
   }
@@ -838,14 +866,35 @@ function parseLoopbackOrigin(input: string): string {
     url.hostname !== LOOPBACK_HOST ||
     url.username ||
     url.password ||
-    url.pathname !== '/' ||
+    !MODEL_BRIDGE_ROUTE_TOKEN_PATTERN.test(
+      url.pathname.slice(1)
+    ) ||
     url.search ||
     url.hash ||
     url.port === ''
   ) {
-    throw new Error('Model bridge origin must be loopback HTTP')
+    throw new Error(
+      'Model bridge origin must be authenticated loopback HTTP'
+    )
   }
-  return url.origin
+  return `${url.origin}${url.pathname}`
+}
+
+function parseModelBridgeRouteToken(value: string): string {
+  if (!MODEL_BRIDGE_ROUTE_TOKEN_PATTERN.test(value)) {
+    throw new Error('Model bridge route capability is invalid')
+  }
+  return value
+}
+
+function authenticatedApiPath(
+  input: string | undefined,
+  routeToken: string
+): string | undefined {
+  const prefix = `/${routeToken}`
+  return input?.startsWith(`${prefix}/`)
+    ? input.slice(prefix.length)
+    : undefined
 }
 
 function boundedMetadataText(