SIGMA ADVANCED SYSTEM Q2 FY27 CONCALL: RAISES FY27 REVENUE GUIDANCE TO ₹1,900–2,000 CR WITH 20% EBITDA MARGIN; TARGETS 25–30% AEROSPACE EBITDA MARGIN BY FY28, ₹10,000+ CR ORDER BOOK & ₹3,000 CR FUNDRAISE FOR GLOBAL ACQUISITIONS