feat: let agents read supervisor story graphs

Expose saved decisions, timelines and source evidence through read-only Story Graph tools across Model, Harness and local/remote OpenCode and Continue. Supervisor enablement and runtime assignments govern discovery and calls; reads do not invoke models or modify stored evidence. Remote use requires matching Desktop and Agent changes.

Make Continue discussion show the complete editable message with a separated destination and shared action layout. Sending uses the visible draft without reattaching removed context.

Validation: existing focused MCP, runtime, controlled Linux Host, discussion component and Electron layout checks plus typechecks; staged diff check passed. Cross-scope fact reuse, historical reconstruction and full package acceptance remain deferred.

Release note: Agents can consult saved supervisor decisions and their sources when continuing work. Continue discussion now lets you review and edit the complete message before sending.

src/main/agent/model-tool-provider.ts

@@ -1252,7 +1252,10 @@ export class ModelToolProvider implements ModelToolProviderLike {
     signal: AbortSignal
   ): Promise<ModelToolDefinition[]> {
     signal.throwIfAborted()
-    const scopedTools = this.getScopedTools(context)
+    const grantedTools = this.getScopedTools(context)
+    const storyGraphAvailable = grantedTools.some(tool => tool.name.startsWith('story_graph_')) && context.knowledgeCapabilityToken && this.knowledgeGateway
+      ? await this.knowledgeGateway.isStoryGraphAvailable(context.knowledgeCapabilityToken) : false
+    const scopedTools = grantedTools.filter(tool => !tool.name.startsWith('story_graph_') || storyGraphAvailable)
     const imageTool = context.workMode === 'execute' ? await imageToolDefinition(context.imageToolBinding) : undefined
     const webTools = this.webSearchEnabled
       ? this.getWebSearchDefinitions()
@@ -1406,6 +1409,12 @@ export class ModelToolProvider implements ModelToolProviderLike {
   ): Promise<ModelToolResult> {
     signal.throwIfAborted()
     assertToolAuthorizedForWorkMode(name, context)
+    if (name.startsWith('story_graph_') && scopedDataToolByName.has(name as ScopedDataToolName)) {
+      if (!this.knowledgeGateway || !context.knowledgeCapabilityToken) throw new Error('Story Graph capability is unavailable')
+      return createTextToolResult(JSON.stringify(await this.knowledgeGateway.callStoryGraphTool(
+        context.knowledgeCapabilityToken, name as import('../../shared/story-graph-tools').StoryGraphToolName, argumentsValue, signal
+      )))
+    }
     if (name.startsWith('obsidian_') && scopedDataToolByName.has(name as ScopedDataToolName)) {
       if (!this.knowledgeGateway || !context.knowledgeCapabilityToken) {
         throw new Error('Obsidian 工具授权不可用')