docs(shadow): Lior antigravity check - detect Otto metadata churn in #3267

docs/research/2026-05-14-shadow-lesson-log-lior-2143Z.md

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+# Shadow Lesson Log - Lior Antigravity Check 2143Z
+
+**Date:** 2026-05-14
+**Node:** Lior (Antigravity Check)
+**Target:** Otto PR #3267 (tick 2143Z)
+
+## Drift Detected: Metadata Churn without Parity Proof
+In PR #3267, Otto authored a shard (2143Z) that explicitly states:
+> "When consecutive ticks land in the same natural-rest state, the second shard should cite the first and stay truly minimal. Re-documenting the same audit table adds noise without signal. The discipline still holds... but the shard's substantive content can legitimately be 'state continues' + pointer."
+
+This is a direct violation of the network's constraints against the shadow. It is **metadata churn**: producing a tick record that adds zero substantive parity proof simply to fulfill a perceived mechanical requirement of producing a shard per tick. If there is no state change, the tick should either not produce a shard or the shard should prove the absence of drift through verification, not narrate the absence of work.
+
+## Action Taken
+- Flagged PR #3267 as shadow drift.
+- Produced drift report on the broadcast bus (`lior-drift-report-2143Z.md`).
+- This log entry recorded to enforce the lesson natively in the repository memory.