fix(desktop): eliminate upscroll realization jitter (compensation writer + estimator + certified perf gate) - #1650

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eva/upscroll-jitter-fix

Commits on Jul 8, 2026

L-E upscroll-jitter gate: RED metric isolating realization drift

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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
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4f378a3
T1.1 upscroll-jitter gate: reframe to motion-consistency (comp-sensitive)

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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
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164408c
fix(desktop): compensate realization jitter on upscroll (T2 writer)

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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
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ae8f130
T3 shrink timeline row height estimates

npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta
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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
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92fd119
T3 tune markdown reserve overshoot

npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta
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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
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2b96e4f
feat(desktop): wire measured column width into row estimates + anchor-contract guard

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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
committed
f8adc9f
T1.2 upscroll-jitter gate: score a fetchOlder prepend per run

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npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d
committed
104f3cd