Implement the analyze overlaps CLI command, RPC endpoint, and ToolDef
to enable heuristic detection of visual overlaps, parent overflows, and
overlay patterns. Geometry computation now uses world-matrix visual
bounds to handle nested ancestor rotations and clipping frames correctly.
Update file-backed CLI commands to use Node fs/promises instead of Bun
runtime file APIs. This is required for the published CLI to function
when installed and executed in a standard Node environment. Add the
package.json subpath export to the core package for metadata consumers.
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