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Dawn's P3 replica-subtraction measurement (2026-07-30, receipts in RESEARCH/BB_PUBLIC_REDIS_P3_ENGINE_CPU_DECOMPOSITION.md) resolves the open <25%-decomposition caveat and lands three spec updates: - D1 gets its gated input: ~40% of primary engine CPU is write-apply + publish propagation (the never-read replica carries 7.8pp of 19.5pp); ~60% is client-facing and divides only as connections/subscriptions redistribute. Notes the A4 dependency (propagation confines to the owning shard only after P2) plus two measurement cautions: the pub/sub-vs-keyed regression split is unidentifiable (r=0.997), and the apparent sublinearity is a ~1.1% fixed baseline. - Fallback row corrected: the replica is not idle — 7.8% is its own unsheddable load on a ~3.8d doubling, saturating alone in ~14 days. Kickoff's 'idles at 7%' framing removed. - Problem statement gains the measured fit window: sharp onset 2026-07-21 ~18:00Z; fits must start post-onset; curr_connections moves in pool-config plateaus, not demand. Onset unattributed pending deploy history. Summary timeline row updated to the fitted ~7d-to-80% with the degraded-fallback note. Model and configs untouched; doc only. Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Signed-off-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz>