🔧 chore(cpp): trim clang-format to intentional google deviations

- keep only the options that differ from Google style, each annotated with
  the Google default, so every override carries its own rationale
- switch to Allman braces and a 120 column limit; short functions now
  collapse only when declared inline
- dropped overrides fall back to Google behaviour, which turns include
  sorting, argument binpacking, comment reflow and namespace comment
  fixing back on
- drop a stray trailing blank line in .clangd

templates/cpp/.clangd

@@ -22,4 +22,3 @@ CompileFlags:
   Add:
     - "-std=c17"
   Compiler: clang
-