ProductCatalog unification: check_warehouse_stock artik product_index ile (gpt-5-mini matcher kalkti)

Audit fixes (3 paralel agent bulgulari): tool zorunlulugu + audio gate + dead code + pre-filter

Iki yonlu cevri: tool input'ta Jaddebostan -> Caddebostan (BizimHesap arar), output Jaddebostan (TTS okur)

Caddebostan -> Jaddebostan (Ingilizce J = TR C sesi)

Hybrid: substring local match -> nano -> token fallback

show_product: nano-first matcher (local fallback ile)

Iki tool: show_product (hafif, local) + check_warehouse_stock (agir, stok sorulunca)

Mirror V2 content into V1 (snapshot for continued development)