docs: retire phase-tracking and ADR-planning scaffolding

Remove the Phase 7 sync plan (committed by mistake in 877cd7e), the
Phase 7 parity report (QA artifact; the project's own ADR-0030 assessment
already concluded parity reports are not user-facing documents), and the
ADR planning documents, whose entries had drifted into contradiction with
the real ADR-0028/0029. Keep ADR.template.md and the ADR index README,
matching the uContract.NET docs/adr layout. Textify the two ADR references
to the retired plan.

Author: cwouyang

docs/PHASE7_SEMANTIC_PARITY_REPORT.md

@@ -228,7 +228,7 @@ removing it was an over-removal, not a design decision.
 - **Java ezddd HEAD `3aac0f5`**: `ezddd-usecase/.../port/in/interactor/Reactor.java`,
   `ezcqrs/.../cqrs/usecase/query/Projector.java`, `ezcqrs/.../cqrs/usecase/query/Notifier.java`
 - **ezDDD.NET commit `2f9235b`** (Phase 6 S3): IMessageBus removal that also removed `IReactor`
-- **[PHASE7_SYNC_PLAN.md](../PHASE7_SYNC_PLAN.md)** — P.2 decision D1, iteration I1
+- Phase 7 synchronization plan (internal working note, not retained) — P.2 decision D1, iteration I1
 
 ---
 

docs/PHASE7_SYNC_PLAN.md

@@ -189,7 +189,7 @@ adds release overhead without present value; it can ship post-1.0 as a non-break
 - **Java ezddd commit `67686ac`** (6.0.0): "[Refactoring] Move MessageProducer interface to
   ezddd-gateway" — deletes `ezddd-usecase/.../port/inout/messaging/MessageProducer.java`
 - **Java ezddd HEAD `3aac0f5`**: core contains no message producer abstraction
-- **[PHASE7_SYNC_PLAN.md](../PHASE7_SYNC_PLAN.md)** — P.2 decision D3, iteration I3
+- Phase 7 synchronization plan (internal working note, not retained) — P.2 decision D3, iteration I3
 - Prior decoupling of repositories from the producer port was recorded in an internal
   session handoff note (superseded by this ADR)