chore: update CLAUDE.md paths + gitignore 旧方向信息/

- CLAUDE.md: rewrite as project reference (training done);
  fix all local paths (remove CompanionGuard-RL nesting in code/)
- .gitignore: add 旧方向信息/ and untrack it from index

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -28,6 +28,9 @@ sync_v*.zip
 # === 大型实验日志 ===
 code/experiments/*.log
 
+# === 旧方向归档 ===
+旧方向信息/
+
 # === 工具配置（用户本地）===
 .claude/
 .playwright-mcp/