W20: Tool Calling 闭环 + Stream+Tools + 回归测试 + session auto-save + ASan CI (W20.1-W20.6)

- W20.1: CLI tool_calls→execute→result→re-call 循环（5轮上限）
- W20.2: deepseek 流式 tool_calls 增量解析（configure 缓存，无 ABI break）
- W20.3: plugin_loader 回归测试 5 块 32 断言（路径/原子性/mock 日志）
- W20.4: plugin_loader ABI 契约校验（name/version/on_init 字段验证）
- W20.5: ASan/UBSan CMake preset + CI sanitizer job（PR-only Linux）
- W20.6: session auto-save（on_shutdown 写 %APPDATA%/dstalk/session.json）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

dstalk-cli/CMakeLists.txt

@@ -10,6 +10,8 @@ set_target_properties(dstalk-cli PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin
 )
 
+find_package(Boost REQUIRED CONFIG)
+
 target_link_libraries(dstalk-cli
-    PRIVATE dstalk
+    PRIVATE dstalk boost::boost dstalk_boost_config
 )