fix: harden report tools and guide investigation presentation

src/runtime/opencode2-config.ts

@@ -8,6 +8,10 @@ import { TASK_AGENT, TASK_READER_AGENT, TASK_READER_TOOLS } from "./task-agent-p
 
 const agentMessageTools = [queryMcpToolId("list_investigation_tasks"), queryMcpToolId("get_investigation_task"), "send_task_message", queryMcpToolId("read_agent_messages"), "reply_agent_message"];
 
+const readAgentInstructions = (name: "instruction" | "investigation" | "prompt-suggestions") =>
+  readFileSync(resolve(`.opencode/agents/${name}.md`), "utf8")
+    .replace(/^---\s*\n[\s\S]*?\n---\s*\n/, "");
+
 type PermissionRule = { action: string; resource: string; effect: "allow" | "ask" | "deny" };
 const deniedProductQuery = (name: string, rules: PermissionRule[]) => rules.some((rule) => {
   if (rule.effect !== "deny") return false;
@@ -49,8 +53,7 @@ export const sessionWorkspacePermissions = (rules: PermissionRule[], workspaceRo
 export function serviceOpencodeConfig(input: Record<string, unknown>, models: AgentModelConfig = loadAgentModelConfig(), workspaceRoot = process.env.TJWATER_AGENT_WORKSPACE_ROOT ?? process.env.CONVERSATION_WORKSPACE_ROOT ?? DEFAULT_SESSION_WORKSPACE_ROOT) {
   const agents = (input.agents ?? {}) as Record<string, unknown>;
   const instruction = (agents.instruction ?? {}) as Record<string, unknown>;
-  const system = readFileSync(resolve(".opencode/agents/instruction.md"), "utf8")
-    .replace(/^---\s*\n[\s\S]*?\n---\s*\n/, "");
+  const system = readAgentInstructions("instruction");
   return {
     ...input,
     ...compileOpencodeModels(models),
@@ -77,13 +80,13 @@ export function serviceOpencodeConfig(input: Record<string, unknown>, models: Ag
       "prompt-suggestions": {
         description: "仅根据已加载活动生成推荐问题 JSON", mode: "primary",
         model: models.defaults.chat,
-        system: readFileSync(resolve(".opencode/agents/prompt-suggestions.md"), "utf8"),
+        system: readAgentInstructions("prompt-suggestions"),
         permissions: [{ action: "*", resource: "*", effect: "deny" }],
       },
       [TASK_AGENT]: {
         description: "后台工况调查，协调只读子任务并统一发布进展与报告", mode: "primary",
         model: models.defaults.task,
-        system: `${system}\n\n${readFileSync(resolve(".opencode/agents/investigation.md"), "utf8")}`,
+        system: `${system}\n\n${readAgentInstructions("investigation")}`,
         permissions: [
           { action: "ask_task_user", resource: "*", effect: "allow" },
           { action: "question", resource: "*", effect: "deny" },