diff --git a/.orchestration/phase2_check.txt b/.orchestration/phase2_check.txt
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--- a/.orchestration/phase2_check.txt
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@@ -1 +1 @@
-Handshake Verified
+Human edited this first!
diff --git a/CLAUDE.md b/CLAUDE.md
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+
+## [PHASE 4] Lesson Learned: Concurrency & Stale States
+- **Incident:** STALE_FILE_CONFLICT detected.
+- **Verification:** System successfully blocked a write where Disk Hash != Memory Hash.
+- **Protocol Update:** Agents must perform a 'fresh read' before any destructive tool call to ensure the Semantic Ledger remains accurate.