feat: add namespace fields + rename files (mcpp 0.0.7+)

All 10 descriptors now carry an explicit `namespace` field:
  compat         — gtest, mbedtls, lua, ftxui
  mcpplibs       — cmdline, tinyhttps, llmapi, xpkg, templates
  mcpplibs.capi  — capi.lua

File naming: compat.<name>.lua / <name>.lua / capi.<name>.lua
Directories reorganised by first letter.

Note: name= fields keep the full qualified form (e.g.
"mcpplibs.cmdline") for backward compat with cached tarballs
whose mcpp.toml still uses old naming. mcpp 0.0.7+ handles the
namespace-vs-name overlap correctly (fe36012).

Author: Sunrisepeak

pkgs/m/mcpplibs.capi.lua.lua pkgs/c/capi.lua.luapkgs/m/mcpplibs.capi.lua.lua renamed to pkgs/c/capi.lua.lua

@@ -3,6 +3,7 @@
 -- finds <verdir>/lua-<tag>/mcpp.toml inside the GitHub tarball wrap.
 package = {
     spec        = "1",
+    namespace = "mcpplibs.capi",
     name        = "mcpplibs.capi.lua",
     description = "C++23 module wrapping the Lua 5.4 C API — `import mcpplibs.capi.lua;`",
     licenses    = {"Apache-2.0"},

pkgs/m/mcpplibs.cmdline.lua pkgs/c/cmdline.luapkgs/m/mcpplibs.cmdline.lua renamed to pkgs/c/cmdline.lua

@@ -10,6 +10,7 @@
 -- `cmdline-<tag>/` wrap layer.
 package = {
     spec        = "1",
+    namespace = "mcpplibs",
     name        = "mcpplibs.cmdline",
     description = "A simple command-line parsing library/framework for modern C++",
     licenses    = {"Apache-2.0"},

pkgs/f/ftxui.lua pkgs/c/compat.ftxui.luapkgs/f/ftxui.lua renamed to pkgs/c/compat.ftxui.lua

@@ -10,6 +10,7 @@
 
 package = {
     spec        = "1",
+    namespace = "compat",
     name        = "ftxui",
     description = "C++ Functional Terminal User Interface (screen + dom + component)",
     licenses    = {"MIT"},

pkgs/g/gtest.lua pkgs/c/compat.gtest.luapkgs/g/gtest.lua renamed to pkgs/c/compat.gtest.lua

@@ -5,6 +5,7 @@
 
 package = {
     spec        = "1",
+    namespace = "compat",
     name        = "gtest",
     description = "Google's C++ test framework",
     licenses    = {"BSD-3-Clause"},

pkgs/l/lua.lua pkgs/c/compat.lua.luapkgs/l/lua.lua renamed to pkgs/c/compat.lua.lua

@@ -11,6 +11,7 @@
 
 package = {
     spec        = "1",
+    namespace = "compat",
     name        = "lua",
     description = "A powerful, efficient, lightweight, embeddable scripting language",
     licenses    = {"MIT"},

pkgs/m/mbedtls.lua pkgs/c/compat.mbedtls.luapkgs/m/mbedtls.lua renamed to pkgs/c/compat.mbedtls.lua

@@ -8,6 +8,7 @@
 
 package = {
     spec        = "1",
+    namespace = "compat",
     name        = "mbedtls",
     description = "An open source, portable, easy to use, readable and flexible TLS library, and reference implementation of the PSA Cryptography API",
     licenses    = {"Apache-2.0"},

pkgs/m/mcpplibs.llmapi.lua pkgs/l/llmapi.luapkgs/m/mcpplibs.llmapi.lua renamed to pkgs/l/llmapi.lua

@@ -3,6 +3,7 @@
 -- wrap (`llmapi-<tag>/mcpp.toml`) automatically.
 package = {
     spec        = "1",
+    namespace = "mcpplibs",
     name        = "mcpplibs.llmapi",
     description = "Modern C++ LLM API client with openai-compatible support",
     licenses    = {"Apache-2.0"},

pkgs/m/mcpplibs.templates.lua pkgs/t/templates.luapkgs/m/mcpplibs.templates.lua renamed to pkgs/t/templates.lua

@@ -5,6 +5,7 @@
 -- default lookup is ambiguous or wrong for your tarball.
 package = {
     spec        = "1",
+    namespace = "mcpplibs",
     name        = "mcpplibs.templates",
     description = "Minimal C++23 modular hello library",
     licenses    = {"Apache-2.0"},

pkgs/m/mcpplibs.tinyhttps.lua pkgs/t/tinyhttps.luapkgs/m/mcpplibs.tinyhttps.lua renamed to pkgs/t/tinyhttps.lua

@@ -3,6 +3,7 @@
 -- finds <verdir>/<repo-tag>/mcpp.toml inside the GitHub tarball wrap.
 package = {
     spec        = "1",
+    namespace = "mcpplibs",
     name        = "mcpplibs.tinyhttps",
     description = "Minimal C++23 HTTP/HTTPS client with SSE streaming support",
     licenses    = {"Apache-2.0"},

pkgs/m/mcpplibs.xpkg.lua pkgs/x/xpkg.luapkgs/m/mcpplibs.xpkg.lua renamed to pkgs/x/xpkg.lua

@@ -3,6 +3,7 @@
 -- finds <verdir>/libxpkg-<tag>/mcpp.toml inside the GitHub tarball wrap.
 package = {
     spec        = "1",
+    namespace = "mcpplibs",
     name        = "mcpplibs.xpkg",
     description = "C++23 reference implementation of the xpkg V1 spec — `import mcpplibs.xpkg;`",
     licenses    = {"Apache-2.0"},