chore(release): 2026.9.6.2

Two engine defects, both found building llama.cpp's Vulkan backend and both of
the same shape -- an answer that was resolved and never wired to the decision
that reads it. A tool declared under `[feature-xlings]` was installed and then
invisible to `mcpp::xpkg_dir`; a shared library acquired through
`[feature-deps]` was compiled and then left off the link line. Neither had a
diagnostic: the first printed "declare this package" about a declaration the
author had already written, and the second let a library package build cleanly
and fail in whoever linked an executable.

Both sites are updated together, as `.github/tools/check_version_pins.sh`
requires.

Author: speak-agent

CHANGELOG.md

@@ -5,6 +5,8 @@
 
 ## [Unreleased]
 
+## [2026.9.6.2] - 2026-09-06
+
 ### docs/20 增加「框架层是什么形状」
 
 四条 lane 证明规则包能驱动四个编译器,不能证明这套机制扛得起一个真会被部署的东西。

mcpp.toml

@@ -1,6 +1,6 @@
 [package]
 name        = "mcpp"
-version = "2026.9.6.1"
+version = "2026.9.6.2"
 description = "Modern C++ build & package management tool"
 license     = "Apache-2.0"
 authors     = ["mcpp-community"]

modules/versioning/src/version.cppm

@@ -31,6 +31,6 @@ import std;
 
 export namespace mcpp {
 
-inline constexpr std::string_view MCPP_VERSION = "2026.9.6.1";
+inline constexpr std::string_view MCPP_VERSION = "2026.9.6.2";
 
 } // namespace mcpp