Currently a detection counts as 'in the zone' only when every anchor in
triggering_anchors is inside. For boxes that straddle the zone boundary
this means a detection with many anchors (e.g. the four corners) is often
under-counted unless the user shrinks triggering_anchors to a single point.
Add require_all_anchors: bool = True so callers can opt into 'any anchor
inside is enough'. Default preserves current behaviour.
* test: strengthen PolygonZone require_all_anchors coverage
* docs: clarify require_all_anchors anchor-based semantics
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Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: OpenAI Codex <codex@openai.com>
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