chore: migrate deps to namespace syntax (mcpp 0.0.6)

Updates mcpp.toml to use explicit namespace fields:
- [package].namespace added
- [package].name uses short name only
- [dependencies.compat] / [dev-dependencies.compat] for non-modular libs
- [dependencies.mcpplibs.capi] for C API wrappers

Author: Sunrisepeak

.github/workflows/ci.yml

@@ -23,17 +23,17 @@ jobs:
           "/tmp/xlings-${XLINGS_VERSION}-linux-x86_64/subos/default/bin/xlings" self install
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
-      - name: Install workspace tools (.xlings.json → mcpp 0.0.4)
+      - name: Install workspace tools (.xlings.json → mcpp 0.0.6)
         run: xlings install -y
 
       # Cache mcpp's self-bootstrapped sandbox (musl-gcc + binutils +
       # glibc + ninja + patchelf, ~800 MB). Toolchain set is pinned by
-      # mcpp 0.0.4, so a fixed key suffices.
+      # mcpp 0.0.6, so a fixed key suffices.
       - name: Cache mcpp sandbox
         uses: actions/cache@v4
         with:
-          path: ~/.xlings/data/xpkgs/xim-x-mcpp/0.0.4/registry
-          key: mcpp-sandbox-${{ runner.os }}-mcpp0.0.4
+          path: ~/.xlings/data/xpkgs/xim-x-mcpp/0.0.6/registry
+          key: mcpp-sandbox-${{ runner.os }}-mcpp0.0.6
 
       - name: Build with mcpp
         run: mcpp build

.xlings.json

@@ -1,5 +1,5 @@
 {
   "workspace": {
-    "mcpp": { "linux": "0.0.4" }
+    "mcpp": { "linux": "0.0.6" }
   }
 }

mcpp.toml

@@ -1,25 +1,19 @@
 [package]
-name        = "mcpplibs.capi.lua"
+namespace   = "mcpplibs.capi"
+name        = "lua"
 version     = "0.0.3"
-description = "C++23 module wrapping the Lua 5.4 C API — `import mcpplibs.capi.lua;`"
+description = "C++23 module wrapping the Lua 5.4 C API — import mcpplibs.capi.lua;"
 license     = "Apache-2.0"
 repo        = "https://github.com/mcpplibs/lua"
 
 [lib]
-# The primary module interface lives at `src/capi/lua.cppm`. The default
-# convention would look at `src/lua.cppm` (last segment of the package
-# name), so override explicitly.
 path = "src/capi/lua.cppm"
 
 [targets.capi-lua]
 kind = "lib"
 
-# `lua` is the upstream Lua 5.4 C library shipped via mcpp-index. mcpp
-# 0.0.3 propagates its headers (lua.h / lauxlib.h / lualib.h) into our
-# compile rule via the transitive include-dir walk.
-[dependencies]
+[dependencies.compat]
 lua = "5.4.7"
 
-# `mcpp test` discovers tests/main.cpp automatically.
-[dev-dependencies]
+[dev-dependencies.compat]
 gtest = "1.15.2"