Add pre-action grounding guard (bounds check + snap-to-element)#364
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Up to standards ✅🟢 Issues
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| Metric | Results |
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| Complexity | 34 |
| Duplication | 0 |
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guardrailscans text for prompt-injection andloop_guarddetects stuck loops — neither validates a coordinate action before dispatch. An agent loop executes whatever the model returns with no bounds/target check, so a hallucinated(9999,-5)click fires into nothing and a 5px-off click misses the button.in_bounds(x, y, screen_size): screen-bounds predicate.snap_to_element(x, y, elements, max_dist): centre of the element at/nearest a point (or None).validate_action(AC_validate_action): rejects out-of-bounds coordinates and, giventargets, snaps a near-miss onto the nearest element centre →{ok, reason, snapped}. Actions without a coordinate pass.screendefaults to the live screen. Plugs in front of an agent loop's dispatch. Wired through all 5 layers + headless test + EN/Zh docs + WHATS_NEW. Qt-free.