Add `authCapture` scheme specification#1425

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A1igator wants to merge 4 commits intox402-foundation:mainfrom

BackTrackCo:feature/escrow-scheme-spec

Commits on Mar 3, 2026

Add escrow scheme specification

A1igator
and
claude
committed

Commits on Mar 11, 2026

Address review feedback on escrow scheme specs
A1igator
committed

Commits on Apr 9, 2026

Rename scheme to commerce and align spec with implementation

A1igator
and
claude
committed

Commits on May 1, 2026

spec: rename escrow/commerce scheme to authCapture, add EVM payload schema
A1igator
committed