v1.1.0 of attest

Continuous accessibility-compliance engine for Flutter. Pure-Dart rules that map findings to WCAG and EN 301 549 success criteria, with CI baseline gating. Changelog excerpt: ### Added - attest/non-text-contrast(WCAG 1.4.11): icons and other non-text glyphs are held to the flat 3:1 minimum instead of the text minimum. ContrastSamplegained an isNonTextflag; the contrast rule now skips non-text samples. ### Fixed - A small icon rendered below 4.5:1 but at or above 3:1 is no longer reported as a text-contrast failure. Icons are non-text content (governed by 1.4.11), so holding them to the text minimum was a false positive.