feat(pkg): opencv 0.0.3 (unified compat.opencv) + retire compat.opencv5 transition alias

opencv-m v0.0.3 switched its dependency from the transitional compat.opencv5
alias to the unified compat.opencv (source build + FFmpeg videoio). With the
module package now on compat.opencv, the alias has no remaining consumers, so
this bump completes the transition decided in #79:

- pkgs/o/opencv.lua: 0.0.2 -> 0.0.3 (v0.0.3 tarball GLOBAL + CN mirror,
  sha256 92ffae8b…; byte-identical, mirror-cn-reachable verified). Form A —
  the compat.opencv dep lives in the tarball's mcpp.toml.
- delete pkgs/c/compat.opencv5.lua and the tests/examples/opencv5 member
  (redundant with the opencv base member; opencv-module now exercises
  compat.opencv transitively via opencv 0.0.3).
- tests/examples/opencv-module: pin opencv 0.0.3, fix compat.opencv comments.
- README + opencv.lua comments: compat.opencv5 -> compat.opencv, note the
  alias is retired.

xpkg parse + lua load green locally on mcpp 0.0.98.

Author: Sunrisepeak

README.md

@@ -32,13 +32,13 @@ mcpp self config --mirror CN   # 切换至国内镜像,默认使用 GLOBAL 上
 
 | 形态 | 示例 |
 |------|------|
-| 原生模块库(Form A) | [`mcpplibs.xpkg`](pkgs/x/xpkg.lua) · [`mcpplibs.tinyhttps`](pkgs/t/tinyhttps.lua) · [`tensorvia-cpu`](pkgs/t/tensorvia-cpu.lua) · [`ffmpeg`](pkgs/f/ffmpeg.lua)(模块层,源码经 `compat.ffmpeg` 直编) · [`opencv`](pkgs/o/opencv.lua)(模块层,源码经 `compat.opencv5` 直编) |
+| 原生模块库(Form A) | [`mcpplibs.xpkg`](pkgs/x/xpkg.lua) · [`mcpplibs.tinyhttps`](pkgs/t/tinyhttps.lua) · [`tensorvia-cpu`](pkgs/t/tensorvia-cpu.lua) · [`ffmpeg`](pkgs/f/ffmpeg.lua)(模块层,源码经 `compat.ffmpeg` 直编) · [`opencv`](pkgs/o/opencv.lua)(模块层,源码经 `compat.opencv` 直编) |
 | C 源码 compat(含 `features`) | [`compat.cjson`](pkgs/c/compat.cjson.lua) · [`compat.zlib`](pkgs/c/compat.zlib.lua) |
 | header-only(含 `features`) | [`compat.eigen`](pkgs/c/compat.eigen.lua) |
 | 数据资产包(feature 依赖专用) | [`compat.opencv-unifont`](pkgs/c/compat.opencv-unifont.lua)(CJK 字体,由 `compat.opencv` 的 `unifont` feature 拉取) |
 | 外部构建系统(`install()` 从源码构建) | [`compat.openblas`](pkgs/c/compat.openblas.lua)(Make) |
 | 全源码直编(config 快照 + 源列表,零外部构建系统) | [`compat.ffmpeg`](pkgs/c/compat.ffmpeg.lua)(2281 TU 含 NASM 汇编,28 个目录 glob 声明) |
-| 全源码直编 + `build.mcpp` 消费端合成 | [`compat.opencv`](pkgs/c/compat.opencv.lua)(OpenCV 5,458 TU 真实路径直编,SIMD dispatch 保留,字体/内核/jpeg12/16 由包内 build.mcpp 生成,依赖 `compat.ffmpeg` 提供 videoio FFmpeg 后端;feature:`unifont` CJK 字体、`dnn` 深度学习模块(+309 TU 含 protobuf/mlas);旧 install() CMake 形态已移除,`compat.opencv5` 为过渡别名待删) |
+| 全源码直编 + `build.mcpp` 消费端合成 | [`compat.opencv`](pkgs/c/compat.opencv.lua)(OpenCV 5,458 TU 真实路径直编,SIMD dispatch 保留,字体/内核/jpeg12/16 由包内 build.mcpp 生成,依赖 `compat.ffmpeg` 提供 videoio FFmpeg 后端;feature:`unifont` CJK 字体、`dnn` 深度学习模块(+309 TU 含 protobuf/mlas);旧 install() CMake 形态与过渡别名 `compat.opencv5` 均已移除) |
 | C++23 module wrapper | [`nlohmann.json`](pkgs/n/nlohmann.json.lua) · [`marzer.tomlplusplus`](pkgs/m/marzer.tomlplusplus.lua) |
 
 ### 新增一个包

mcpp.toml

@@ -26,7 +26,6 @@ members = [
     "tests/examples/nlohmann.json",
     "tests/examples/openblas",
     "tests/examples/opencv",
-    "tests/examples/opencv5",
     "tests/examples/opencv-unifont",
     "tests/examples/opencv-dnn",
     "tests/examples/opencv-module",

pkgs/c/compat.opencv5.lua

@@ -4,28 +4,29 @@
 --
 -- The package is the thin C++23 module layer (import opencv.cv; and 7
 -- per-module interfaces) over OpenCV 5's unchanged C++ API; the OpenCV
--- sources themselves arrive through its compat.opencv5 dependency (full
--- source build with SIMD dispatch + build.mcpp consumer-side synthesis —
--- see pkgs/c/compat.opencv5.lua). Linux-only for now: compat.opencv5
--- carries a linux-x86_64 config snapshot.
+-- sources themselves arrive through its compat.opencv dependency (full
+-- source build with SIMD dispatch + build.mcpp consumer-side synthesis,
+-- plus the compat.ffmpeg videoio backend — see pkgs/c/compat.opencv.lua;
+-- the transitional compat.opencv5 alias is retired as of this bump).
+-- Linux-only for now: compat.opencv carries a linux-x86_64 config snapshot.
 --
 package = {
     spec        = "1",
     name        = "opencv",
     namespace   = "",
-    description = "C++23 module package for OpenCV 5 (import opencv.cv) — full source build via compat.opencv5, C++ API unchanged",
-    licenses    = {"MIT"},   -- module layer; upstream via compat.opencv5 is Apache-2.0
+    description = "C++23 module package for OpenCV 5 (import opencv.cv) — full source build via compat.opencv, C++ API unchanged",
+    licenses    = {"MIT"},   -- module layer; upstream via compat.opencv is Apache-2.0
     repo        = "https://github.com/Sunrisepeak/opencv-m",
     type        = "package",
 
     xpm = {
         linux = {
-            ["0.0.2"] = {
+            ["0.0.3"] = {
                 url    = {
-                    GLOBAL = "https://github.com/Sunrisepeak/opencv-m/archive/refs/tags/v0.0.2.tar.gz",
-                    CN     = "https://gitcode.com/mcpp-res/opencv/releases/download/v0.0.2/opencv-m-0.0.2.tar.gz",
+                    GLOBAL = "https://github.com/Sunrisepeak/opencv-m/archive/refs/tags/v0.0.3.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/opencv/releases/download/v0.0.3/opencv-m-0.0.3.tar.gz",
                 },
-                sha256 = "26c3eb680baff72ce71dd41d098910b5456487a686d95839b2157c6618ccfb7c",
+                sha256 = "92ffae8bc4253538143319fba59d4933831a92bb03394126baae2f0a3d4b0e2b",
             },
         },
     },

pkgs/o/opencv.lua

@@ -3,18 +3,18 @@
 # member-level `[indices] default` redirect, mcpp >= 0.0.97; kept per-member
 # and single-entry because xlings breaks with >1 project index repo, mcpp#238). Replaces the
 # former tests/smoke_opencv_module.sh reseeding driver. The package is
-# linux-only (it pulls the linux-only compat.opencv5 source build); off-Linux
+# linux-only (it pulls the linux-only compat.opencv source build); off-Linux
 # the test compiles to a no-op main().
 [package]
 name    = "opencv-module-tests"
 version = "0.1.0"
 
-# The module package's own transitive dep (compat.opencv5) resolves from the
+# The module package's own transitive dep (compat.opencv) resolves from the
 # GLOBAL published compat index (the compat namespace is not redirected here
 # — see the mcpp#238 single-repo constraint); the compat descriptor itself is
 # pre-merge-validated by its dedicated member.
 [indices]
 default = { path = "../../.." }
 
 [target.'cfg(linux)'.dependencies]
-opencv = "0.0.2"
+opencv = "0.0.3"