feat(lsp): implement exhaustive autocompletion, semantic hover, and code actions

Skip plugin tests for zig cc in run_tests.sh

Fix Clang compatibility in Lisp plugin and unify test suite

Modernize native plugins (ZC) and stabilize build core

Standardize buffer allocations by eliminating magic numbers and using semantic macros from constants.h

fix: #384

Fix non-standard empty struct initialization: use {0} for portability

Cleanup: remove temp test and fix portable types test

Standardize C type names: rename c_long_long/c_ulong_long to c_longlong/c_ulonglong

Stabilize string interpolation and comptime execution

fix: #385

Fix Zen C slice transpilation naming, ordering, and generic registration issues. Add regression tests.

Refactor diagnostic system and fix internal warnings

docs: update setup instructions in translations (cd Zen-C -> cd zenc)

Merge pull request #369 from z0rhan/readme-installation