Add clang-format and clang-tidy to pre-commit hooks

- .pre-commit-config.yaml: Integrate clang-format (v17) and clang-tidy for C/C++ linting
  Excludes build artifacts (.pio), tests, and board configs from linting
- .clang-format: Configure LLVM-style formatting with 4-space indents, 88-char line limit
  Enforces right pointer alignment, comment reflow, consistent brace placement
- .clang-tidy: Configure strict static analysis with snake_case identifiers
  Enables all checks except Fuchsia/LLVM lib checks and abseil checks
  Treats warnings as errors

.clang-format

@@ -0,0 +1,18 @@
+---
+Language: C
+Standard: C99
+BasedOnStyle: LLVM
+IndentWidth: 4
+ColumnLimit: 88
+UseTab: Never
+BreakBeforeBraces: Attach
+AllowShortBlocksOnASingleLine: Never
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+AlwaysBreakBeforeMultilineStrings: false
+BreakStringLiterals: true
+PointerAlignment: Right
+DerivePointerAlignment: false
+SortIncludes: true
+ReflowComments: true
+MaxEmptyLinesToKeep: 2

.clang-tidy

@@ -0,0 +1,24 @@
+---
+Checks: |
+  *,
+  -fuchsia-*,
+  -llvmlibc-*,
+  -abseil-*,
+  -google-readability-braces-around-statements,
+  -readability-braces-around-statements,
+  -readability-implicit-bool-conversion,
+HeaderFilterRegex: 'src/.*\.h'
+WarningsAsErrors: '*'
+CheckOptions:
+  - key: readability-identifier-naming.VariableCase
+    value: snake_case
+  - key: readability-identifier-naming.FunctionCase
+    value: snake_case
+  - key: readability-identifier-naming.MacroDefinitionCase
+    value: UPPER_CASE
+  - key: readability-identifier-naming.EnumConstantCase
+    value: UPPER_CASE
+  - key: modernize-use-auto.MinTypeNameLength
+    value: '8'
+  - key: performance-inefficient-string-concatenation.WarnOnImplicitConversion
+    value: '1'

.pre-commit-config.yaml

@@ -19,3 +19,31 @@ repos:
     hooks:
       - id: markdownlint
         args: ['--fix', '--disable', 'MD040', '--disable', 'MD013']
+
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v17.0.6
+    hooks:
+      - id: clang-format
+        types: [c, c++, header]
+        args: ['-i']  # In-place formatting
+        exclude: |
+          (?x)^(
+            \.pio/|
+            test/|
+            soc/|
+            hardware/
+          )
+
+  - repo: https://github.com/pocc/pre-commit-hooks
+    rev: v1.3.5
+    hooks:
+      - id: clang-tidy
+        types: [c, c++, header]
+        args: ['-checks=*,-fuchsia-*,-llvmlibc-*']
+        exclude: |
+          (?x)^(
+            \.pio/|
+            test/|
+            soc/|
+            hardware/
+          )