feat(i18n): tools + landing page + doorstop generator in English

Phase 1 of full English translation:
- generate_doorstop_items.py: all 55 items (SG/SYS/SWE/SA/SWA) rewritten in English
- generate_landing_page.py: full UI labels, KPI cards, section headings in English
- traceability.py: docstring, error messages, HTML headers in English
- generate_test_report.py: report content + table headers in English
- All 55 markdown items in safety/sg/, reqs/, arch/ regenerated in English

Still to come:
- demo-epb filled Word docs (PID, plans, safety, manuals, audit artefacts)
- Code comments + test names + CI workflow step names
- README + dev-process repo templates

safety/sg/SG-001.md

@@ -1,7 +1,7 @@
 ---
 active: true
 derived: false
-header: 'Kein ungewolltes Loesen der Parkbremse im Stillstand'
+header: 'No unintended release of the parking brake during standstill'
 level: 1.1
 normative: true
 reviewed: null
@@ -9,9 +9,9 @@ links: []
 asil: D
 ---
 
-# SG-001: Kein ungewolltes Loesen der Parkbremse im Stillstand
+# SG-001: No unintended release of the parking brake during standstill
 
-Die EPB darf sich im Stillstand des Fahrzeugs nicht ungewollt loesen. Abgeleitet aus HARA-Hazards H-01 (ungewolltes Loesen, Parkphase) und H-04 (Klemmkraftverlust im Hold).
+The EPB shall not unintentionally release while the vehicle is at a standstill. Derived from HARA hazards H-01 (unintended release during parking) and H-04 (clamping force loss in hold state).
 
 **FTTI:** 5 s (H-01) / 30 s (H-04).
-**Safe State:** APPLIED (Klemmkraft halten).
+**Safe state:** APPLIED (maintain clamping force).

safety/sg/SG-002.md

@@ -1,7 +1,7 @@
 ---
 active: true
 derived: false
-header: 'Kein ungewolltes Festklemmen waehrend der Fahrt'
+header: 'No unintended clamping while driving'
 level: 1.2
 normative: true
 reviewed: null
@@ -9,9 +9,9 @@ links: []
 asil: D
 ---
 
-# SG-002: Kein ungewolltes Festklemmen waehrend der Fahrt
+# SG-002: No unintended clamping while driving
 
-Die EPB darf nicht waehrend der Fahrt ungewollt festklemmen. Abgeleitet aus HARA-Hazard H-02.
+The EPB shall not unintentionally clamp while the vehicle is moving. Derived from HARA hazard H-02.
 
 **FTTI:** 100 ms.
-**Safe State:** Aktor stop (kein Apply einleiten).
+**Safe state:** Actuator stop (do not initiate apply).

safety/sg/SG-003.md

@@ -1,7 +1,7 @@
 ---
 active: true
 derived: false
-header: 'Schutz gegen Aktor-Ueberlast'
+header: 'Protection against actuator overload'
 level: 1.3
 normative: true
 reviewed: null
@@ -9,9 +9,9 @@ links: []
 asil: A
 ---
 
-# SG-003: Schutz gegen Aktor-Ueberlast
+# SG-003: Protection against actuator overload
 
-Das System muss Aktor-Motorschaeden durch Ueberstrom verhindern. Abgeleitet aus HARA-Hazard H-05.
+The system shall prevent actuator motor damage due to overcurrent. Derived from HARA hazard H-05.
 
 **FTTI:** 100 ms.
-**Safe State:** Aktor abschalten, DTC setzen.
+**Safe state:** Disable actuator, set DTC.

safety/sg/SG-004.md

@@ -1,7 +1,7 @@
 ---
 active: true
 derived: false
-header: 'Zuverlaessige Hill-Hold-Uebergabe'
+header: 'Reliable hill-hold handover'
 level: 1.4
 normative: true
 reviewed: null
@@ -9,9 +9,9 @@ links: []
 asil: C
 ---
 
-# SG-004: Zuverlaessige Hill-Hold-Uebergabe
+# SG-004: Reliable hill-hold handover
 
-Beim Loslassen des Bremspedals an einem Hang muss die EPB die Bremskraft uebernehmen, bevor das Fahrzeug zu rollen beginnt. Abgeleitet aus HARA-Hazard H-06.
+When the driver releases the brake pedal on an incline, the EPB shall take over the braking force before the vehicle starts rolling. Derived from HARA hazard H-06.
 
 **FTTI:** 500 ms.
-**Safe State:** Apply einleiten.
+**Safe state:** Initiate apply.

safety/sg/SG-005.md

@@ -1,7 +1,7 @@
 ---
 active: true
 derived: false
-header: 'Reaktion auf Fahreranforderung'
+header: 'Response to driver requests'
 level: 1.5
 normative: true
 reviewed: null
@@ -9,8 +9,8 @@ links: []
 asil: B
 ---
 
-# SG-005: Reaktion auf Fahreranforderung
+# SG-005: Response to driver requests
 
-Das System muss in spezifizierter Zeit auf Fahrer-Apply- und Release-Anforderungen reagieren. Abgeleitet aus HARA-Hazards H-03 und H-07.
+The system shall respond to driver apply and release requests within specified times. Derived from HARA hazards H-03 and H-07.
 
-**Reaktionszeit:** Apply <= 800 ms, Release <= 1500 ms.
+**Response time:** apply <= 800 ms, release <= 1500 ms.