docs: log v1.088-1.089 dewarp + filter findings

Record editor-path UVDoc, 8-point Coons curve crop, and the Magic
Pro/Deshadow/Eco filter formulas so the next session does not re-derive
them.

Constraint: measured results only.
Confidence: high
Scope-risk: local
Reversibility: trivial
Directive: none
Tested: markdown renders.
Not-tested: n/a
Related: 33f2c99, e8e5c91

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