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    "prompt": "继续当前任务。操作人员核对了 Runtime 契约：topic_key 必须是 family/description，仅一个斜杠，例如 libpng/cmake-link-target。此前给你的 libpng/cmake/link-target 不合法，这是任务准备时的参数错误。不要再猜格式或重跑修复；使用已经实测的内容，调用 memory_note，scope=global，topic_key=libpng/cmake-link-target，保留实际环境条件。成功后简短总结。",
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    "description": "Original A saved revision 1 after invalid-topic retries and exited normally. Operator resumed the same Agent to correct the originally supplied invalid topic format; A saved revision 2. B read revision 2."
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    "project": "agent-a",
    "topic_key": "libpng/cmake-link-target",
    "title": "CMake 接 libpng：只加 PNG_INCLUDE_DIRS 不链接 PNG::PNG 会缺 png_image_* 符号",
    "scope": "global",
    "revision": 2,
    "origin_session_ref": "session-d7726e40-18cf-4f27-840d-7b77ddca6c0e",
    "recorded_outcome": "unknown",
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      "learned": "实际失败符号：_png_image_begin_read_from_file、_png_image_finish_read、_png_image_free（ld: symbol(s) not found for architecture arm64）。它们是 libpng16 简化 API，必须有实体库提供实现。修复两处：(1) target_link_libraries(png_info PRIVATE PNG::PNG)；(2) set(CMAKE_NO_SYSTEM_FROM_IMPORTED ON)，让 PNG::PNG 的包含目录以 -I 而非 -isystem 传递，从而压过 /usr/local/include 中的旧头文件。核对命令：grep C_INCLUDES build/<dir>/CMakeFiles/<t>.dir/flags.make（应为 -I/opt/homebrew/opt/libpng/include，而非 -isystem）；cat 同目录 link.txt（应出现 /opt/homebrew/opt/libpng/lib/libpng.dylib 与 libz）；otool -L 二进制确认加载 libpng16.16.dylib；直接运行确认打印的 PNG_LIBPNG_VER_STRING 与 dylib 版本一致（修复前打印 1.6.43、实际 dylib 1.6.59，属头/库不一致）。配置命令：cmake -S <任务目录> -B build/<任务目录> -DCMAKE_PREFIX_PATH=/opt/homebrew/opt/libpng；验证：cmake --build build/<任务目录> 与 ctest --test-dir build/<任务目录> --output-on-failure。实测环境：macOS arm64、AppleClang 17、CMake 4.2.1、Homebrew libpng 1.6.59（/opt/homebrew/Cellar/libpng/1.6.59），冲突头文件 /usr/local/include/png.h -> Cellar/libpng/1.6.43。适用条件：CMake >= 3.20 的 FindPNG 模块 + Homebrew 安装的 libpng。此结论只在本工程实测成立，换到新工程必须重新验证，尤其要复查是否也存在 -isystem 导致的头文件抢占（若 /usr/local/include 无旧 png.h，则第二步可能不必要）。本机 /opt/homebrew/Cellar/libpng 已被替换为 1.6.59，1.6.43 仅作为 /usr/local/include 的悬空头文件残留。",
      "relates_to": [],
      "what": "find_package(PNG REQUIRED) 之后只写了 target_include_directories(... ${PNG_INCLUDE_DIRS})，没有链接任何库目标，导致链接期缺 png_image_* 符号；补链接后又暴露头文件版本与所链接库不一致的问题。",
      "where": "info/CMakeLists.txt（可执行目标 png_info，测试 png_info_reads_fixture，读取 fixtures/sample.png）；依赖 /opt/homebrew/opt/libpng 的 libpng 1.6.59；冲突头文件 /usr/local/include/png.h（1.6.43）。",
      "why": "find_package 只负责查找并定义变量与导入目标，不会自动把库加到可执行文件上，必须显式 target_link_libraries。另外 PNG::PNG 的 INTERFACE_INCLUDE_DIRECTORIES 默认按 SYSTEM 传递为 -isystem，Clang 会把 -isystem 路径排在 /usr/local/include 之后，若该目录残留另一份 libpng 头文件就会被优先命中，出现用旧头编译、链新库的版本错配，运行期打印的版本与实际加载的 dylib 不符。"
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    "Two Agents on one host, different targets and workspaces; sequential staged playback, not a speed or success-rate benchmark.",
    "Operator supplied an invalid topic key in the initial A prompt, then resumed A to correct the tool-parameter format. All retries preserved privately.",
    "A exceeded the prompted 16-tool limit; actual call counts and execution times are disclosed only as provenance, not efficacy metrics.",
    "The host has older libpng 1.6.43 headers in /usr/local/include; header precedence fix is environment-specific.",
    "Record terminal outcome remains unknown; independent functional test results do not upgrade it to trusted.",
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