fix: dummy @spaces.GPU placeholder — no GPU allocation, no quota consumption (same pattern as neurorag-2026)

fix: use GPU properly — @spaces.GPU + device_map=auto for A10G

fix: load pipeline inside @spaces.GPU + force SentenceTransformer to CPU

Aethron Portfolio Agent v3: 27+ projects, 8 verticals, Phi-3.5-mini, expanded KB with domain sections

Aethron Portfolio Agent v2: Phi-3.5-mini + FAISS + keyword fallback, HF Spaces compatible