LIMBFORGE AUTHORITATIVE PATCH READINESS
========================================================================

server_projects_schema_anchor=PASS
server_measurements_schema_anchor=PASS
server_projects_api_anchor=PASS
server_osseointegration_anchor=PASS
frontend_projects_api_anchor=PASS
frontend_osseointegration_anchor=PASS

PATCH SCOPE
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1. Add safe idempotent database migration.
2. Add oi_type validation to project create/update.
3. Add OI type selection to the project form.
4. Add measurement session storage.
5. Add immutable Design Forge measurement snapshots.
6. Preserve all existing projects, measurements and safety fields.
7. Leave CoverCanvas manufacturing export blocked.

decision=READY_FOR_AUTHORITATIVE_SCHEMA_PATCH