docs(plan): ingestion restructure implementation plan

20 tasks across four phases, each phase ending at a shippable state.
Phase 1 additive only, Phase 2 renames and document collections, Phase 3
route cutover, Phase 4 drops. Nothing is deleted before Phase 4, so every
earlier phase is reversible.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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DEls 2026-09-11 10:21:29 +02:00
parent 8075f6798a
commit 9a8d637ff1

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