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

tasks/openclawd-migration-2026-03/READ-RULES.md

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+# READ RULES
+
+## Session Boot Read
+- Read from vault runtime files:
+  - `SOUL.md`, `USER.md`, `AGENTS.md`, `HEARTBEAT.md`
+
+## Memory Fact Read
+- Prefer remote memory-gateway query (`require_latest=true`).
+- Use `branch=main` for long-term facts.
+- Use `branch=task/<task-id>` for active collaboration context.
+
+## Fallback Read
+- Local qmd search on collective lanes is allowed for draft/debug fallback.