legal: TCC and Lua license declarations

- THIRD-PARTY-NOTICES.txt gains sections for the Tiny C Compiler
  (0.9.28rc, LGPL-2.1, modified for MontaukOS; source in
  programs/src/tcc/) and Lua (5.4.8, MIT, Lua.org PUC-Rio).
- LGPL-2.1 full text ships at 0:/os/licenses/LGPL-2.1.txt (copied from
  the vendored TCC COPYING); Lua's MIT text is reproduced in the
  notices file.
- Both components added to the license's third-party list and man legal.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

montaukos.org/license.txt

@@ -72,7 +72,8 @@ obtained by others are unaffected. Sections 3, 5, 6, and 7 survive termination.
 The Software incorporates or is distributed alongside third-party components
 that remain the property of their respective owners and are licensed under
 their own terms, including the Limine bootloader, BearSSL, stb_image, the DOOM
-engine (via doomgeneric), the Flat Remix icon theme, and the bundled fonts.
+engine (via doomgeneric), the Tiny C Compiler, Lua, the Flat Remix icon theme,
+and the bundled fonts.
 Nothing in this license modifies, supersedes, or limits the license terms
 applicable to those components; to the extent of any conflict, the third-party
 license controls for that component. The applicable copyright notices and