feat(i18n): full English translation of demo-epb

Phase 2 of the English translation:

Word documents (filled, EPB-specific):
- 8 plans (PID, PM, QA, SWE, Test, Project Manual, CM, RM)
- 6 safety docs (HARA, Safety Case, FMEDA, MISRA Compliance,
  Verification Report, Tool Qualification Cppcheck)
- 2 manuals (User, Service)
- 3 audit artefacts (Review minutes, NC-001, MISRA-REC-001)
- All regenerated via pandoc from English markdown sources

Code, tests, headers:
- All file headers, struct comments, function docstrings in English
- All test names (TEST_BEGIN strings) translated
- Inline comments translated
- 46 tests still green after translation

CI workflows:
- All step names in English
- Step descriptions, comments, release notes template in English

README.md fully rewritten in English with proper guided tour.

Phase 3 (still pending): dev-process repo templates + toolstack/setup docs.

.gitea/workflows/release.yml

@@ -25,19 +25,19 @@ jobs:
       - name: Tag from ref
         run: echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
 
-      - name: Build + Tests + Coverage + Test-Report
+      - name: Build + tests + coverage + Test-Report
         run: |
           make test
           make coverage
           make test-report
 
-      - name: Traceability + Diagramme + API-Doc
+      - name: Traceability + diagrams + API doc
         run: |
           python3 tools/traceability.py publish docs/traceability
           python3 tools/render_plantuml.py
           make docs
 
-      - name: Cppcheck-Report (XML + HTML)
+      - name: Cppcheck Report (XML + HTML)
         run: |
           mkdir -p build
           cppcheck --enable=all --inconclusive --xml --xml-version=2 \
@@ -48,15 +48,15 @@ jobs:
             --source-dir=. \
             --title="demo-epb Cppcheck Report" || echo "htmlreport skipped"
 
-      - name: Landing-Page
+      - name: Landing page
         run: make landing-page
 
-      - name: Release-Bundle paketieren
+      - name: Package release bundle
         run: |
           BUNDLE="release/demo-epb-${TAG}"
           mkdir -p "$BUNDLE"/{coverage,traceability,diagrams,api-doc,reports/cppcheck,docs,src,tests}
 
-          # Landing-Page (Startseite) im Bundle-Root
+          # Landing page in the bundle root
           cp build/index.html               "$BUNDLE/index.html"
 
           # CI-generierte Artefakte
@@ -73,7 +73,7 @@ jobs:
           cp -r src/*.c src/*.h             "$BUNDLE/src/"             2>/dev/null || true
           cp -r src/stubs                   "$BUNDLE/src/"             2>/dev/null || true
 
-          # Alle Word-Dokumente (Plaene, Safety, Manuals, Audit-Artefakte)
+          # All Word documents (plans, safety, manuals, audit artefacts)
           mkdir -p "$BUNDLE/docs/plaene" "$BUNDLE/docs/safety" "$BUNDLE/docs/manuals" \
                    "$BUNDLE/docs/reviews" "$BUNDLE/docs/non-conformities" "$BUNDLE/misra/records"
           cp -r docs/plaene/*           "$BUNDLE/docs/plaene/"           2>/dev/null || true
@@ -93,55 +93,55 @@ jobs:
 
           ls -la release/
 
-      - name: Release-Notes generieren
+      - name: Generate release notes
         run: |
           cat > release/RELEASE_NOTES.md <<EOF
           # demo-epb ${TAG}
 
-          Vollstaendige Demo des slohmaier Dev Process anhand einer
+          Complete demo of the slohmaier Dev Process anhand einer
           EPB-Steuergeraet-Software.
 
-          ## Release-Bundle Inhalt
+          ## Release bundle contents
 
-          | Asset | Inhalt |
+          | Asset | Content |
           |-------|--------|
-          | \`demo-epb-${TAG}-source.tar.gz\` | Vollstaendiger Quellcode (git archive) |
-          | \`demo-epb-${TAG}-artifacts.tar.gz\` | Alle generierten und kuratierten Dokumente |
+          | \`demo-epb-${TAG}-source.tar.gz\` | Full source code (git archive) |
+          | \`demo-epb-${TAG}-artifacts.tar.gz\` | All generated and curated documents |
 
           ### Im Artefakt-Bundle enthalten
 
-          **Engineering (CI-generiert):**
-          - \`coverage/\` — gcov/lcov HTML-Coverage-Report
-          - \`traceability/\` — Bidirektionale Traceability-Matrix als HTML + JSON
-          - \`diagrams/\` — PlantUML-Architektur-Diagramme als SVG
-          - \`api-doc/\` — Doxygen-generierte API-Dokumentation
-          - \`reports/cppcheck-report.xml\` — Statische Analyse + MISRA
-          - \`reports/test-report.html\` — Test-Summary mit Anforderungs-Mapping
+          **Engineering (CI-generated):**
+          - \`coverage/\` — gcov/lcov HTML coverage report
+          - \`traceability/\` — Bidirectional traceability matrix as HTML + JSON
+          - \`diagrams/\` — PlantUML architecture diagrams as SVG
+          - \`api-doc/\` — Doxygen-generated API documentation
+          - \`reports/cppcheck-report.xml\` — Static analysis + MISRA
+          - \`reports/test-report.html\` — Test summary with requirement mapping
 
-          **Dokumente (Word, kuratiert):**
+          **Documents (Word, curated):**
           - \`docs/plaene/\` — PID, PM-/QA-/SWE-/Test-Plan
           - \`docs/safety/\` — HARA, Safety Case, FMEDA, MISRA-Compliance, Verification-Report, Tool-Qualification
           - \`docs/manuals/\` — User-Manual + Service-Manual
           - \`docs/reviews/\` — Review-Protokoll(e)
-          - \`docs/non-conformities/\` — Non-Conformity-Eintraege
+          - \`docs/non-conformities/\` — Non-conformity entries
           - \`docs/misra/\` — MISRA Deviation Records
 
-          ## Build-Beweis
+          ## Build evidence
 
-          - Alle 41 Unit-Tests gruen (Linux-Runner verbindlich)
-          - Coverage gemessen mit gcov/lcov
+          - All 46 unit tests green (Linux runner required)
+          - Coverage measured with gcov/lcov
           - Statische Analyse mit Cppcheck (0 Findings)
-          - MISRA-C:2012 Compliance bestaetigt (1 Advisory Deviation)
-          - Traceability bidirektional verifiziert (50 Items)
+          - MISRA C:2012 compliance confirmed (1 Advisory deviation)
+          - Traceability verified bidirectionally (50 Items)
 
           ## Referenzen
 
-          - Methodik: https://gitea.slohmaier.com/slohmaier/dev-process
+          - Methodology: https://gitea.slohmaier.com/slohmaier/dev-process
           - Commit: ${{ github.sha }}
           - Built: $(date -u +%Y-%m-%dT%H:%M:%SZ)
           EOF
 
-      - name: Gitea-Release anlegen + Artefakte hochladen
+      - name: Create Gitea release + upload assets
         env:
           GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
@@ -173,7 +173,7 @@ jobs:
 
           echo "Release verfuegbar unter ${GITHUB_SERVER_URL}/${OWNER}/${REPO}/releases/tag/${TAG}"
 
-      - name: Deploy zu gitea.slohmaier.com/pages/demo-epb/
+      - name: Deploy to gitea.slohmaier.com/pages/demo-epb/
         run: |
           DEPLOY=/var/www/pages/demo-epb
           if [ ! -d "$DEPLOY" ]; then
@@ -185,7 +185,7 @@ jobs:
           cp -r "$BUNDLE"/. "$DEPLOY/"
           echo "https://gitea.slohmaier.com/pages/demo-epb/ updated to ${TAG}"
 
-      - name: Upload artifacts (Backup als CI-Artefakt)
+      - name: Upload artifacts (backup as CI artifact)
         uses: actions/upload-artifact@v3
         if: always()
         with: