feat: WidgetDemo baseline#69

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engalar wants to merge 4 commits intomendixlabs:mainfrom

engalar:feat/widget-demo

Commits on Apr 1, 2026

fix: int32→int64 for BSON property values, CREATE OR REPLACE PAGE UUID reuse

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feat: diag --check-units + grammar compatibility fixes

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feat: pluggable widget engine v2

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feat: WidgetDemo baseline scripts and widget analysis

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