feat: Vollstaendige Demo-Doku — Safety, Manuals, Reports, API-Doc

Neue Word-Dokumente (alle aus Markdown via pandoc):

Safety (docs/safety/):
- HARA.docx — Hazard Analysis & Risk Assessment, leitet ASIL-D ab
- Safety-Case.docx — Argumentation pro Safety Goal (GSN-Stil)
- FMEDA.docx — Pro-Komponente Failure Modes + Diagnostic Coverage
- MISRA-Compliance-Statement.docx — formaler MISRA-Nachweis
- Verification-Report.docx — V-Modell rechte Seite Zusammenfassung
- Tool-Qualification-Cppcheck.docx — Tool-Qual (TCL2/ASIL-D)

Manuals (docs/manuals/):
- User-Manual.docx — Fahrerhandbuch-Auszug
- Service-Manual.docx — Werkstatt-Doku mit UDS-DTCs

CI-Erweiterungen:
- Doxyfile + `make docs` — API-Dokumentation aus src/
- tools/generate_test_report.py + `make test-report` — Test-Summary HTML
- validate.yml: Doxygen + Test-Report als CI-Artefakte
- release.yml: alle Word-Docs + Engineering-Artefakte ins Release-Bundle

README:
- Komplette Tour durch alle Artefakte
- Repo-Struktur-Diagramm aktualisiert

Makefile

@@ -21,10 +21,19 @@ TESTS   = test_switch_debouncer test_actuator_driver test_apply_controller \
           test_safety_manager
 TEST_BINS = $(TESTS:%=$(BUILD)/%)
 
-.PHONY: all test coverage clean misra static
+.PHONY: all test coverage clean misra static docs test-report
 
 all: $(TEST_BINS)
 
+docs:
+	@which doxygen >/dev/null 2>&1 || { echo "doxygen not installed (brew/apt install doxygen)"; exit 1; }
+	doxygen Doxyfile
+	@echo "Doxygen HTML: $(BUILD)/api-doc/html/index.html"
+
+test-report: $(TEST_BINS)
+	@$(MAKE) -s test > $(BUILD)/test-output.txt 2>&1 || true
+	python3 tools/generate_test_report.py
+
 $(BUILD)/%.o: %.c
 	@mkdir -p $(dir $@)
 	$(CC) $(CFLAGS) $(COVFLAGS) -I$(SRC_DIR) -c $< -o $@