Add full automotive RTOS project

Add kernel (Cortex-M0/M3/M4, Tricore, S32K, RISC-V ports), drivers,
middleware (CAN stack, diagnostics, safety), applications, board
support, build/test tooling, and documentation.

.gitattributes

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+# ============================================================================
+# Auto detect text files and normalize line endings
+# ============================================================================
+* text=auto
+
+# ============================================================================
+# Source code files
+# ============================================================================
+*.c text diff=cpp
+*.h text diff=cpp
+*.cpp text diff=cpp
+*.hpp text diff=cpp
+*.cc text diff=cpp
+*.cxx text diff=cpp
+
+# ============================================================================
+# Script files
+# ============================================================================
+*.sh text eol=lf
+*.bash text eol=lf
+*.py text eol=lf
+*.pl text eol=lf
+*.rb text eol=lf
+
+# ============================================================================
+# Build files
+# ============================================================================
+Makefile text eol=lf
+*.mk text eol=lf
+*.cmake text eol=lf
+CMakeLists.txt text eol=lf
+
+# ============================================================================
+# Configuration files
+# ============================================================================
+*.json text eol=lf
+*.yaml text eol=lf
+*.yml text eol=lf
+*.xml text eol=lf
+*.toml text eol=lf
+*.ini text eol=lf
+*.cfg text eol=lf
+*.conf text eol=lf
+
+# ============================================================================
+# Documentation files
+# ============================================================================
+*.md text eol=lf
+*.rst text eol=lf
+*.txt text eol=lf
+*.tex text eol=lf
+
+# ============================================================================
+# Binary files
+# ============================================================================
+*.bin binary
+*.elf binary
+*.hex binary
+*.out binary
+*.o binary
+*.obj binary
+*.a binary
+*.so binary
+*.dll binary
+*.exe binary
+*.lib binary
+
+# ============================================================================
+# Image files
+# ============================================================================
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.bmp binary
+*.ico binary
+*.svg text
+
+# ============================================================================
+# Linker scripts
+# ============================================================================
+*.ld text eol=lf
+*.lds text eol=lf
+
+# ============================================================================
+# Assembly files
+# ============================================================================
+*.s text eol=lf
+*.S text eol=lf
+*.asm text eol=lf
+
+# ============================================================================
+# Git files
+# ============================================================================
+.gitignore text eol=lf
+.gitattributes text eol=lf
+.gitmodules text eol=lf
+
+# ============================================================================
+# Editor configuration
+# ============================================================================
+.editorconfig text eol=lf
+.clang-format text eol=lf
+.clang-tidy text eol=lf
+
+# ============================================================================
+# Specific files
+# ============================================================================
+LICENSE text eol=lf
+CHANGELOG.md text eol=lf
+CONTRIBUTING.md text eol=lf
+SECURITY.md text eol=lf
+README.md text eol=lf
+
+# ============================================================================
+# Language-specific settings
+# ============================================================================
+*.c linguist-language=C
+*.h linguist-language=C
+*.cpp linguist-language=C++
+*.hpp linguist-language=C++
+*.py linguist-language=Python
+*.sh linguist-language=Shell
+*.md linguist-documentation
+
+# ============================================================================
+# Diff settings
+# ============================================================================
+*.c diff=cpp
+*.h diff=cpp
+*.cpp diff=cpp
+*.hpp diff=cpp
+*.py diff=python
+*.sh diff=bash
+*.md diff=markdown
+
+# ============================================================================
+# Merge settings
+# ============================================================================
+*.c merge=union
+*.h merge=union
+*.cpp merge=union
+*.hpp merge=union
+
+# ============================================================================
+# Export ignore (files not included in archives)
+# ============================================================================
+.gitattributes export-ignore
+.gitignore export-ignore
+.github export-ignore
+.vscode export-ignore
+build export-ignore