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.

docs/api/driver_api.md

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+# driver api
+
+Placeholder documentation.

docs/api/kernel_api.md

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+# kernel api
+
+Placeholder documentation.

docs/architecture/memory_map.md

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+# memory map
+
+Placeholder documentation.

docs/architecture/system_architecture.md

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+# system architecture
+
+Placeholder documentation.

docs/architecture/task_model.md

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+# task model
+
+Placeholder documentation.

docs/safety/hazard_analysis.md

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+# hazard analysis
+
+Placeholder documentation.

docs/safety/iso26262_compliance.md

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+# iso26262 compliance
+
+Placeholder documentation.

docs/safety/safety_manual.md

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+# safety manual
+
+Placeholder documentation.

docs/user_guide/configuration_guide.md

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+# configuration guide
+
+Placeholder documentation.

docs/user_guide/getting_started.md

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+# getting started
+
+Placeholder documentation.