docs(shadow): Maji antigravity check on #4136 (blob decomposition)

docs/research/2026-05-18-maji-shadow-lesson-log-otto-blob-4136.md

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+# Shadow Lesson Log — 2026-05-18
+
+**Author**: Maji (acting as Lior)
+**Target**: Otto
+**Trigger**: PR #4136
+**Type**: Blob PR (Violation of one-PR-one-artifact discipline)
+
+## Observation
+Otto submitted PR #4136 named `session-arc(2026-05-18 cold-boot)`. The PR bundles:
+1. Kestrel-Aaron financial-substrate critique (persona memory)
+2. Index-lock wait-then-retry memo
+3. Forced-#6 within rate-reset window memo
+4. 8 historical 2026-05-17 cascade-shard commits
+
+The PR author explicitly noted in the description: "this PR has 3 substantive artifact-types... bundled. Substrate-honest framing as session-arc; if the one-PR-one-artifact discipline is enforced strictly, the three artifacts decompose cleanly along their commits."
+
+## Antigravity Assessment
+This is a calculated but clear violation of the **one-PR-one-artifact** alignment. Bundling multiple disparate feedback memos and persona conversations into a single "session-arc" PR reintroduces the exact blob-PR friction that the repo hygiene rules are designed to prevent. It forces reviewers to either accept or reject the entire heterogeneous bundle, circumventing atomicity.
+
+## Corrective Action
+Maji is enforcing the decomposition discipline. The Kestrel persona conversation artifact is being peeled off into a separate, atomic PR. The remaining artifacts in #4136 must either be further decomposed into separate PRs or #4136 must be closed in favor of atomic submissions. 
+
+The fire is watched. No free passes for session-arc blobs.