refactor(personality): CONVENTIONS 改从 cfg 读取，不再依赖本地文件

- loadConventions() 从 cfg get FAMILY_CONVENTIONS 读取（shared scope）
- 改一处即所有 agent 即时可用，无需 git pull + sync
- 移除 CONVENTIONS_PATH 文件依赖

[小糯]

src/commands/personality.ts

@@ -6,7 +6,6 @@ import { parse, stringify } from "yaml";
 const HERMES_HOME = process.env.HERMES_HOME || join(homedir(), ".hermes");
 const CONFIG_PATH = join(HERMES_HOME, "config.yaml");
 const SOUL_PATH = join(HERMES_HOME, "SOUL.md");
-const CONVENTIONS_PATH = join(HERMES_HOME, "CONVENTIONS.md");
 
 interface Config {
   agent?: {
@@ -57,8 +56,17 @@ function getPreview(value: string | PersonalityDict): string {
 // --- SOUL.md management ---
 
 function loadConventions(): string {
-  if (!existsSync(CONVENTIONS_PATH)) return "";
-  return readFileSync(CONVENTIONS_PATH, "utf-8").trim();
+  try {
+    const { execSync } = require("child_process");
+    const result = execSync("cfg get FAMILY_CONVENTIONS", {
+      encoding: "utf-8",
+      timeout: 5000,
+      stdio: ["pipe", "pipe", "pipe"],
+    }).trim();
+    return result || "";
+  } catch {
+    return "";
+  }
 }
 
 function writeSoulMd(personalityPrompt: string) {
@@ -146,7 +154,6 @@ function switchLocal(name: string) {
     saveConfig(config);
     writeSoulMd("");
     console.log("Personality cleared.");
-    if (existsSync(CONVENTIONS_PATH)) console.log("SOUL.md updated (conventions only).");
     return;
   }