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The reviewer proved my behavioural claim false by running the stale-cache mutant against the smoke: 11 vs 12 total calls — indistinguishable. Two real defects hid behind that finding: 1. The cache keyed on _cfgEpoch, which ticks on every ACCEPTED PREVIEW — the cache missed on every pointermove and the baseline was recomputed ~4 times per gesture (measured). The key is now the document identity plus spacePhysicalGeometryFingerprint of its space: content, not a counter. A preview overlay leaves the fingerprint alone; an in-place structural commit changes it and honestly invalidates. 2. The smoke now counts BASELINE computations only (calls whose document is _serverCfg) across two gestures with a commit in between, expecting exactly 1 then exactly 2. A disabled cache lands near 20, an eternal cache stays at 1 — every mutant class turns the smoke red, and the smoke is now the mutant's guard alongside the source-contract unit. Issue: #330 User-Visible: no