v0.3.0

feat!: biome-style falcon-ignore suppression syntax

Replace analyzer-style // ignore: comments with
// falcon-ignore <section>/<group>/<rule>: <reason> (and falcon-ignore-all
for file scope). The reason is mandatory; missing reasons, wrong groups,
and unknown rules surface a malformed-suppression warning instead of
silently not suppressing. Dart's own // ignore: comments no longer
affect falcon. Bump to 0.3.0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>