feat: add Germany corridor sources, institution, and scenario (#40 PR 3/4)

Author: HirenGajjar

data/institutions/de/drv.yaml

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+id: institution:de:drv
+object_type: Institution
+name: "Deutsche Rentenversicherung (DRV)"
+jurisdiction:
+  country: DE
+  region: null
+  municipality: null
+function: "German statutory pension insurance body responsible for retirement pensions, survivor benefits, rehabilitation, and cross-border pension coordination. Handles survivor pension (Hinterbliebenenrente) claims and coordinates with foreign pension authorities for cross-border workers."
+official_site: "https://www.deutsche-rentenversicherung.de"
+contact_channels:
+  - type: website
+    value: "https://www.deutsche-rentenversicherung.de"
+    notes: "Main DRV portal for pension information, online applications, and international services."
+languages:
+  - de
+source_ids:
+  - source:de:drv-hinterbliebenenrente
+  - source:de:drv-rente-und-ausland
+verification_status: structured-from-source
+provenance:
+  created_at: "2026-05-29"
+  created_by: "HirenGajjar"
+  updated_at: null
+  updated_by: null
+notes: "DRV is a network of regional carriers plus DRV Bund (federal). For Luxembourg frontaliers (~55,000 daily commuters), DRV Rheinland-Pfalz and DRV Saarland are typically the competent carriers. DRV organises international advisory days with Luxembourg CNAP representatives. Survivor pension requires 5-year qualifying period and marriage/partnership at time of death."

data/scenarios/corridor-lu-de.yaml

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+id: scenario:corridor-lu-de
+object_type: Scenario
+title: "Luxembourg — Germany cross-border bereavement corridor"
+description: "Cross-border bereavement scenario for families connected to both Luxembourg and Germany, covering approximately 55,000 frontaliers who commute to Luxembourg from Germany daily."
+scenario_type: corridor
+countries:
+  - LU
+  - DE
+condition_ids:
+  - condition:deceased-is-foreign-national
+  - condition:deceased-is-frontalier
+  - condition:survivor-resides-abroad
+  - condition:assets-in-multiple-jurisdictions
+  - condition:repatriation-of-remains
+source_ids:
+  - source:eu:brussels-iv-regulation
+  - source:eu:social-security-coordination
+  - source:de:drv-hinterbliebenenrente
+  - source:de:drv-rente-und-ausland
+verification_status: discovered
+publication_status: draft
+provenance:
+  created_at: "2026-05-29"
+  created_by: "HirenGajjar"
+  updated_at: null
+  updated_by: null
+notes: "Germany is the second largest frontalier corridor for Luxembourg (~55,000 daily commuters). Key cross-border facts: DRV survivor pension requires marriage/partnership at death and 5-year qualifying period; Sterbevierteljahr provision grants 3 months at deceased's full pension rate with no income offset after death; DRV coordinates with CNAP via EU social security coordination; DRV provides international advisory days for frontaliers; succession governed by Brussels IV habitual residence rule."

data/sources/de/drv-hinterbliebenenrente.yaml

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+id: source:de:drv-hinterbliebenenrente
+object_type: Source
+title: "Renten für Hinterbliebene"
+title_de: "Renten für Hinterbliebene"
+description: "Official Deutsche Rentenversicherung guidance on survivor pensions in Germany, covering widow/widower pensions, orphan pensions, and the Sterbevierteljahr transitional provision. Includes eligibility conditions and application process."
+description_de: "Offizielle Informationen der Deutschen Rentenversicherung zu Hinterbliebenenrenten, einschließlich Witwen- und Witwerrenten, Waisenrenten und der Sterbevierteljahr-Regelung. Enthält Anspruchsvoraussetzungen und Antragsverfahren."
+source_type: institutional_page
+url: "https://www.deutsche-rentenversicherung.de/DRV/DE/Rente/In-der-Rente/Hinterbliebenenrente/hinterbliebenenrente_node.html"
+jurisdiction:
+  country: DE
+  region: null
+  municipality: null
+languages:
+  - de
+institution_ids:
+  - institution:de:drv
+accessed_at: "2026-05-29"
+last_verified_at: "2026-05-29"
+evidence_locator: null
+reuse_notes: "Official Deutsche Rentenversicherung source. Extract only source-backed administrative facts."
+verification_status: source-checked
+provenance:
+  created_at: "2026-05-29"
+  created_by: "HirenGajjar"
+  updated_at: null
+  updated_by: null
+notes: "URL verified 2026-05-29 — page loads correctly, title confirmed as 'Renten für Hinterbliebene'. Key facts: marriage or registered partnership must exist at time of death; 5-year qualifying period (allgemeine Wartezeit) required; Sterbevierteljahr grants 3 months at deceased's full pension rate with no income offset."

data/sources/de/drv-rente-und-ausland.yaml

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+id: source:de:drv-rente-und-ausland
+object_type: Source
+title: "Arbeit und Rente im Ausland"
+title_de: "Arbeit und Rente im Ausland"
+description: "Official Deutsche Rentenversicherung guidance on cross-border pension services, covering pension rights for those who worked abroad, coordination with foreign pension authorities, and international advisory services."
+description_de: "Offizielle Informationen der Deutschen Rentenversicherung zu grenzüberschreitenden Rentenleistungen, einschließlich Rentenansprüchen aus Auslandstätigkeit, Koordination mit ausländischen Rententrägern und internationalen Beratungsangeboten."
+source_type: institutional_page
+url: "https://www.deutsche-rentenversicherung.de/DRV/DE/Rente/Ausland/ausland_node.html"
+jurisdiction:
+  country: DE
+  region: null
+  municipality: null
+languages:
+  - de
+institution_ids:
+  - institution:de:drv
+accessed_at: "2026-05-29"
+last_verified_at: "2026-05-29"
+evidence_locator: null
+reuse_notes: "Official Deutsche Rentenversicherung source. Extract only source-backed administrative facts."
+verification_status: source-checked
+provenance:
+  created_at: "2026-05-29"
+  created_by: "HirenGajjar"
+  updated_at: null
+  updated_by: null
+notes: "URL verified 2026-05-29 — page loads correctly, title confirmed as 'Arbeit und Rente im Ausland'. DRV provides dedicated international advisory days (Internationale Beratungstage) for cross-border workers including Luxembourg frontaliers. Coordinates survivor pension claims with foreign pension authorities via EU social security coordination."