Memory-aware C exporter rewrite (no gRPC/Arrow-C++; OTLP/HTTP + nanoarrow)

.clang-format

@@ -1,11 +1,11 @@
 ---
+# Language stays Cpp: clang-format has no separate C mode; Cpp mode formats C.
 Language: Cpp
 BasedOnStyle: Google
 ColumnLimit: 100
 IndentWidth: 2
 TabWidth: 2
 UseTab: Never
-AccessModifierOffset: -1
 AlignAfterOpenBracket: Align
 AlignConsecutiveMacros: true
 AlignTrailingComments: true
@@ -14,14 +14,10 @@ AllowAllParametersOfDeclarationOnNextLine: true
 AllowShortBlocksOnASingleLine: Empty
 AllowShortFunctionsOnASingleLine: Inline
 AllowShortIfStatementsOnASingleLine: Never
-AllowShortLambdasOnASingleLine: Inline
 AllowShortLoopsOnASingleLine: false
-AlwaysBreakTemplateDeclarations: Yes
 BinPackArguments: true
 BinPackParameters: true
 BreakBeforeBraces: Attach
-BreakConstructorInitializers: BeforeColon
-BreakInheritanceList: BeforeColon
 DerivePointerAlignment: false
 PointerAlignment: Left
 IncludeBlocks: Preserve
@@ -42,14 +38,11 @@ IncludeCategories:
     Priority: 3
 SortIncludes: true
 SpaceAfterCStyleCast: false
-SpaceAfterTemplateKeyword: true
 SpaceBeforeAssignmentOperators: true
-SpaceBeforeCpp11BracedList: false
 SpaceBeforeParens: ControlStatements
 SpaceInEmptyParentheses: false
-SpacesInAngles: false
 SpacesInCStyleCastParentheses: false
 SpacesInContainerLiterals: true
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard: c++17
+Standard: Latest

.clang-tidy

@@ -1,12 +1,15 @@
 ---
+# C codebase: google-* and modernize-* (C++-only check sets) are intentionally
+# absent; bugprone-* carries the leak/UB checks the C error paths rely on.
+# bugprone-easily-swappable-parameters is excluded: the (buf, len) and
+# (errbuf, errlen) parameter pairs used throughout the export API trip it on
+# nearly every function.
 Checks: >
   -*,
+  bugprone-*,
+  -bugprone-easily-swappable-parameters,
   clang-analyzer-*,
   clang-diagnostic-*,
-  google-*,
-  -google-readability-todo,
-  modernize-*,
-  -modernize-use-trailing-return-type,
   readability-*,
   -readability-magic-numbers,
   -readability-identifier-length
@@ -15,7 +18,7 @@ WarningsAsErrors: >
   clang-analyzer-core.NullDereference,
   clang-analyzer-unix.*
 
-HeaderFilterRegex: 'include/pg_stat_ch/.*'
+HeaderFilterRegex: '(include/(pg_stat_ch|config)|src)/.*'
 
 CheckOptions:
   - key: readability-identifier-naming.ClassCase