refactor: migrate image apps to owned packages

[Pluze]

Summary

• move image-measurement app helpers from app-local private folders into app-owned package namespaces: +batch_crop, +curvature, and +focus_stack
• remove image-measurement string-dispatch workflow adapters and update tests to call package functions directly
• add project guardrails for app-owned package layout, no image-measurement private folders, no *Workflow adapters, and no direct startup path exposure for package folders
• update app architecture docs and agent rules for the new app-owned package structure

Tests

• git diff --check
• /Applications/MATLAB_R2025a.app/bin/matlab -batch "buildtool testAppsImageMeasurement"
• /Applications/MATLAB_R2025a.app/bin/matlab -batch "buildtool testProject"
• /Applications/MATLAB_R2025a.app/bin/matlab -batch "buildtool testAppsImageMeasurementGui"
• /Applications/MATLAB_R2025a.app/bin/matlab -batch "buildtool test"
• /Applications/MATLAB_R2025a.app/bin/matlab -batch "buildtool checkStyle"

Not Verified

• full manual interactive GUI workflows in MATLAB app windows