Adds a Research findings section with sourced numbers (Schmedeke fatness
model, virtual bass weighting, group-delay audibility, timbral tension,
coupled controls, layer coherence, heard timing of layered hits, loopback
FM, beat rates of detuned layers) and where each goes in the suite.
New problems 19-21, new ideas Braze, Arc and the fatness lane, additions
to Anvil, Weld, Crucible, Forge and Loupe, and a research track in the
build order. Also updates stale release notes for Patina and Planish.
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