feat: generate and edit conversation images across runtimes

Add model-controlled image invocation and read-only runtime assignments. Route image tools through Main so accepted operations retain their originating conversation when chat runtimes change, with saved references, cancellation, and manual recovery.

Keep Node hashing outside browser-shared contracts to restore production builds. Validation includes the production build, typecheck, lint, focused regressions, real Host transport checks, and two successful real image requests. Full UI-driven runtime switching acceptance remains documented as pending.

Release note: 开启图片模型的会话调用后，聊天助手可调用图片生成与编辑工具，Runtime 分配自动管理。图片成果保存在原会话，可继续修改，并独立显示生成状态和取消入口。

src/main/agent/deepseek-harness-runtime.ts

@@ -290,7 +290,7 @@ function isMainWebTool(
   )
 }
 
-function dshCompatibleWebInputSchema(
+function dshCompatibleMainInputSchema(
   schema: Record<string, unknown>
 ): Record<string, unknown> {
   const compatible: Record<string, unknown> = {}
@@ -311,7 +311,7 @@ function dshCompatibleWebInputSchema(
           propertySchema &&
           typeof propertySchema === 'object' &&
           !Array.isArray(propertySchema)
-            ? dshCompatibleWebInputSchema(
+            ? dshCompatibleMainInputSchema(
                 propertySchema as Record<string, unknown>
               )
             : propertySchema
@@ -325,7 +325,7 @@ function dshCompatibleWebInputSchema(
       typeof value === 'object' &&
       !Array.isArray(value)
     ) {
-      compatible.items = dshCompatibleWebInputSchema(
+      compatible.items = dshCompatibleMainInputSchema(
         value as Record<string, unknown>
       )
       continue
@@ -335,7 +335,7 @@ function dshCompatibleWebInputSchema(
         candidate &&
         typeof candidate === 'object' &&
         !Array.isArray(candidate)
-          ? dshCompatibleWebInputSchema(
+          ? dshCompatibleMainInputSchema(
               candidate as Record<string, unknown>
             )
           : candidate
@@ -350,8 +350,8 @@ function proxyToolInputSchema(
     ReturnType<ModelToolProviderLike['listTools']>
   >[number]
 ): Record<string, unknown> {
-  return isMainWebTool(tool)
-    ? dshCompatibleWebInputSchema(tool.inputSchema)
+  return isMainWebTool(tool) || tool.name === 'generate_image'
+    ? dshCompatibleMainInputSchema(tool.inputSchema)
     : tool.inputSchema
 }
 
@@ -368,7 +368,7 @@ function boundedProxyToolCatalog(
   const catalog = tools.filter(
     (tool) =>
       isMainWebTool(tool) ||
-      (workMode === 'execute' && tool.source === 'mcp')
+      (workMode === 'execute' && (tool.source === 'mcp' || tool.name === 'generate_image'))
   )
   if (catalog.length > MAX_MCP_PROXY_TOOLS) {
     throw new Error(
@@ -386,7 +386,7 @@ function boundedProxyToolCatalog(
     names.add(tool.name)
     const description = tool.description.slice(
       0,
-      MAX_MCP_TOOL_DESCRIPTION_CHARACTERS
+      tool.name === 'generate_image' ? imageToolDescriptionLimit : MAX_MCP_TOOL_DESCRIPTION_CHARACTERS
     )
     const inputSchema = proxyToolInputSchema(tool)
     let serialized: string
@@ -838,6 +838,7 @@ export class DeepSeekHarnessRuntime implements AgentRuntime {
                 const run = this.activeRuns.get(params.sessionId)
                 if (!run?.toolProvider || run.closed) return { tools: [] }
                 const context = {
+                  imageToolBinding: run.request.imageToolBinding,
                   conversationId:
                     run?.request.conversationId ??
                     'deepseek-harness-tool-catalog',
@@ -855,7 +856,7 @@ export class DeepSeekHarnessRuntime implements AgentRuntime {
                 )
                 const catalog = boundedProxyToolCatalog(tools, context.workMode)
                 this.proxyToolCatalogs.set(params.sessionId, tools.filter(
-                  (tool) => tool.source === 'mcp' || isMainWebTool(tool)
+                  (tool) => tool.source === 'mcp' || isMainWebTool(tool) || tool.name === 'generate_image'
                 ))
                 return { tools: catalog }
               }
@@ -881,6 +882,8 @@ export class DeepSeekHarnessRuntime implements AgentRuntime {
                   )
                 }
                 const context = {
+                  imageToolBinding: run.request.imageToolBinding,
+                  ...(name === 'generate_image' ? { toolCallId: typeof params.callId === 'string' ? params.callId : crypto.randomUUID() } : {}),
                   conversationId: run.request.conversationId,
                   browserTabId: run.request.browserTabId,
                   workMode:
@@ -894,7 +897,7 @@ export class DeepSeekHarnessRuntime implements AgentRuntime {
                 const tool = tools.find(
                   (candidate) =>
                     candidate.name === name &&
-                    (candidate.source === 'mcp' ||
+                    (candidate.source === 'mcp' || candidate.name === 'generate_image' ||
                       isMainWebTool(candidate))
                 )
                 if (!tool) {
@@ -1754,3 +1757,4 @@ export class DeepSeekHarnessRuntime implements AgentRuntime {
     ).catch(() => undefined)
   }
 }
+import { imageToolDescriptionLimit } from '../../shared/image-generation-contracts'