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.

.gitignore

@@ -0,0 +1,156 @@
+# ============================================================================
+# Build Artifacts
+# ============================================================================
+build/
+out/
+bin/
+obj/
+*.o
+*.obj
+*.elf
+*.hex
+*.bin
+*.map
+*.lst
+*.d
+*.dep
+*.depend
+*.su
+
+# ============================================================================
+# IDE Files
+# ============================================================================
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+*.user
+*.suo
+*.VC.db
+*.VC.opendb
+
+# ============================================================================
+# CMake
+# ============================================================================
+CMakeFiles/
+CMakeCache.txt
+cmake_install.cmake
+CTestTestfile.cmake
+compile_commands.json
+Makefile
+
+# ============================================================================
+# Debug Files
+# ============================================================================
+*.log
+*.trace
+*.prof
+*.gcda
+*.gcno
+*.gcov
+coverage/
+htmlcov/
+
+# ============================================================================
+# Documentation
+# ============================================================================
+docs/html/
+docs/latex/
+docs/pdf/
+build/docs/
+doxygen/
+*.aux
+*.toc
+*.out
+*.pdf
+
+# ============================================================================
+# Test Files
+# ============================================================================
+test_results/
+test_output/
+*.test
+*.result
+
+# ============================================================================
+# Dependency Files
+# ============================================================================
+node_modules/
+vendor/
+third_party/cmsis/  # Optional, depending on project setup
+
+# ============================================================================
+# Environment
+# ============================================================================
+.env
+.env.local
+.env.*.local
+
+# ============================================================================
+# Temporary Files
+# ============================================================================
+tmp/
+temp/
+*.tmp
+*.bak
+*.orig
+*.rej
+
+# ============================================================================
+# Compressed Files
+# ============================================================================
+*.zip
+*.tar
+*.tar.gz
+*.tgz
+*.7z
+*.rar
+
+# ============================================================================
+# Specific Files
+# ============================================================================
+*.hex
+*.bin
+*.elf
+*.axf
+*.map
+*.o
+*.d
+*.lst
+*.su
+*.cmd
+*.bat
+
+# ============================================================================
+# Keep specific files
+# ============================================================================
+!.gitkeep
+!.gitignore
+!.gitattributes
+
+# ============================================================================
+# Exception rules
+# ============================================================================
+# Keep example configuration files
+!config/*.example.h
+!config/*.template.h
+
+# Keep documentation source
+!docs/**/*.md
+!docs/**/*.rst
+
+# Keep linker scripts
+!**/*.ld
+!**/*.lds
+
+# Keep assembly files
+!**/*.s
+!**/*.S
+
+# Keep build scripts
+!**/build_*.sh
+!**/flash_*.sh
+!**/setup_*.sh