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File moves executed 07/09/26: sandbox moved to backend/sandbox/, FE info stubs trashed (BE versions kept), loose stubs (progress/server-map/tasks) trashed, tech/php.html moved to 30-Tech/, tech/ and info/ dirs removed. 05-Front_end now contains index.html + 10-travel/ + 30-Tech/ + 60-Finance/ + 70-Health/ only. backend/projects/ and backend/sessions/ confirmed. Restructure board log entry e003 posted. Master [01] to verify before Phase 2.