docs(13): create phase plan — scraping adapters + cross-source dedup

6 plans (INGEST-02/03/07, SCHEMA-03) + Nyquist validation.
Core (registry, fingerprint, dedup, TenderSource, backfill) lands
first and is green independent of live scraping (D-01).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -439,7 +439,15 @@ Plans:
   3. A tender that appears via both DÖE and a scraping adapter shows up once in the results list (fuzzy fingerprint dedup on buyer+title+CPV+deadline+value), with links to all of its source portals -- dedup logic only activates once a second source is live
   4. Attempting to register vergabe24 or aumass as a poll source is refused by the system itself (adapter registry denylist enforced in code), not just documented as forbidden
 
-**Plans**: TBD
+**Plans**: 6 plans
+
+Plans:
+- [ ] 13-01-PLAN.md — TenderSource-Schema + Backfill + NULL-tolerante Fingerprint-Fn + SourceType-Union (SCHEMA-03 Datenschicht)
+- [ ] 13-02-PLAN.md — SourceRegistry + harte Denylist-Gate (vergabe24/aumass) + Adapter-Interface-Generalisierung (INGEST-07)
+- [ ] 13-03-PLAN.md — 3-Stufen-Dedup-Resolver + pollDueSources Fan-out (catch-per-source) + Modul-Wiring (SCHEMA-03)
+- [ ] 13-04-PLAN.md — NetServer-Adapter (config-getrieben, 3 Portale) + Package-Legitimacy-Checkpoint (INGEST-02)
+- [ ] 13-05-PLAN.md — cosinex/DTVP-Adapter (separat, best-effort) (INGEST-03)
+- [ ] 13-06-PLAN.md — Read-Endpoint include sources[] + TenderDetail Multi-Source-Links (SCHEMA-03 Anzeige)
 
 ### Phase 14: RSS, Email-Alert Ingestion & Module Rollout