Add Vexer connector suite, format normalizers, and tooling

seed-data/cert-bund/README.md

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+# CERT-Bund Offline Kit Seed Data
+
+This directory stores **offline snapshots** for the CERT-Bund connector.
+The artefacts mirror the public JSON search and export endpoints so
+air‑gapped deployments can hydrate the connector without contacting the
+portal.
+
+> ⚠️ **Distribution notice** – CERT-Bund advisories are published by BSI
+> (Federal Office for Information Security, Germany). Review the portal
+> terms of use before redistributing the snapshots. Always keep the JSON
+> payloads and accompanying SHA-256 sums together.
+
+## Recommended layout
+
+```
+seed-data/cert-bund/
+├── search/                     # paginated search JSON files
+│   ├── certbund-search-page-00.json
+│   └── …
+├── export/                     # yearly export JSON files
+│   ├── certbund-export-2014.json
+│   └── …
+├── manifest/
+│   └── certbund-offline-manifest.json
+└── certbund-offline-manifest.sha256
+```
+
+Use `certbund-offline-manifest.json` to feed the Offline Kit build: every
+entry contains `source`, `from`, `to`, `sha256`, `capturedAt`, and the
+relative file path. The manifest is deterministic when regenerated with
+the tooling described below.
+
+## Tooling
+
+Run the helper under `tools/` to capture fresh snapshots or regenerate
+the manifest:
+
+```
+python tools/certbund_offline_snapshot.py --output seed-data/cert-bund
+```
+
+See the connector operations guide
+(`docs/ops/feedser-certbund-operations.md`) for detailed usage,
+including how to provide cookies/tokens when the portal requires manual
+authentication.
+
+## Git hygiene
+
+- JSON payloads and checksums are **ignored by Git**. Generate them
+  locally when preparing an Offline Kit bundle.
+- Commit documentation, scripts, and manifest templates only – never the
+  exported advisory data itself.