chore: 移除发行版与低价值 CI 表面

项目处于收口归档模式，不再发行版本。删除：
- git tag v1.3.0（本地+远程）
- benchmark.yml workflow（手动触发，归档后不再跑）
- sanitizers.yml workflow（PR 门禁，归档后不再引入并发缺陷；preset 保留供本地按需使用）
- ci.yml 中 linux-release-clang 与 macos-release 两个 job（debug 已覆盖基础回归）
- SECURITY.md 的 Supported Versions 表（无发行版无版本支持概念）

保留 release preset，因 docs/examples 中 31 处命令引用依赖该优化构建配置。

Author: holtwood

.github/SECURITY.md

@@ -1,11 +1,5 @@
 # Security Policy
 
-## Supported Versions
-
-| Version | Supported          |
-| ------- | ------------------ |
-| 1.3.x   | :white_check_mark: |
-
 ## Reporting a Vulnerability
 
 If you discover a security vulnerability in this project, please report it by

.github/workflows/benchmark.yml

@@ -64,70 +64,6 @@ jobs:
       - name: Test
         run: ctest --preset=debug
 
-  linux-release-clang:
-    name: Linux Release (Clang)
-    runs-on: ubuntu-latest
-    env:
-      CC: clang
-      CXX: clang++
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-
-      - name: Cache CMake dependencies
-        uses: actions/cache@v5
-        with:
-          path: |
-            build/release/_deps
-            ~/.cache/ccache
-          key: cmake-deps-${{ runner.os }}-clang-release-${{ hashFiles('cmake/Dependencies.cmake') }}
-          restore-keys: |
-            cmake-deps-${{ runner.os }}-clang-
-            cmake-deps-${{ runner.os }}-
-
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y ninja-build clang libomp-dev
-
-      - name: Configure
-        run: cmake --preset=release
-
-      - name: Build
-        run: cmake --build --preset release
-
-      - name: Test
-        run: ctest --preset=release
-
-  macos-release:
-    name: macOS Release
-    runs-on: macos-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-
-      - name: Cache CMake dependencies
-        uses: actions/cache@v5
-        with:
-          path: |
-            build/release/_deps
-            ~/Library/Caches/ccache
-          key: cmake-deps-${{ runner.os }}-release-${{ hashFiles('cmake/Dependencies.cmake') }}
-          restore-keys: |
-            cmake-deps-${{ runner.os }}-
-
-      - name: Install dependencies
-        run: brew install ninja libomp
-
-      - name: Configure
-        run: cmake --preset=release
-
-      - name: Build
-        run: cmake --build --preset release
-
-      - name: Test
-        run: ctest --preset=release
-
   docs:
     name: Docs build & tests
     runs-on: ubuntu-latest