docs(migration): finalize phase docs, validation, and rollback pack

tasks/openclawd-migration-2026-03/TARGET-ARCHITECTURE.md

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+# TARGET ARCHITECTURE
+
+## Layer A: Runtime (OpenClaw local)
+- Root: `/Users/lingyuzeng/openclawd/vaults`
+- Responsibility: session boot, persona, local operational control.
+- Authoritative for runtime behavior only.
+
+## Layer B: Durable Memory Authority
+- Root: `/Users/lingyuzeng/project/collective-memory-repo`
+- Responsibility: long-term/shared/task/agent memory.
+- Authoritative for memory facts.
+
+## Retrieval Chain
+- Preferred: `Agent -> memory-gateway (RTX) -> qmd -> git-backed workspace`
+- Fallback: local qmd on collective repo paths.
+
+## Authority Rule
+- Shared truth requires pushed and indexed state on remote gateway.