Add /api/library datasheet import and component GET/PUT with no exam.
Reorganize pytest into datasheet, library, schematic, PCB, and AF+AI.
Document Rust criteria (none chosen; no rustup) and coding conformity.
Partial layouts still use MODE=pcb. Missing copper is INSUFFICIENT or
skipped, never Euclidean stand-in tracks. Via≠Pad unchanged. DELETE
/api/projects/{id} is owner-only with a dashboard confirm dialog.
michele