- set_layout: only change spacing/align/padding when explicitly passed.
Previously spacing/align/padding defaulted to 0/MIN, wiping existing
values when AI only wanted to change one property.
- search_icons: client-side slice to enforce limit (API ignores small
limits, returned 31 results for limit=1)
- system-prompt: issues from describe are mandatory fixes, not advisory.
Final describe after set_* calls is required workflow step.
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