nx_dcf_lib.nx

nx_dcf_lib.nx -- DISCOUNTED CASH FLOW: intrinsic valuation + margin of safety, integer-exact. The operator's "projections -> intrinsic value vs price" ask. This is Graham/Buffett value math: project a firm's free cash flows, discount them (and a terminal value) back to today at the required return, sum to an INTRINSIC value, and compare to the market PRICE with a margin of safety. A stock is a buy only when intrinsic exceeds price by a real margin -- price is what you pay, value is what you get. NO FLOATS: the discount factor is carried scaled x1e6 and rolled forward one period at a time (df_t = df_{t-1} * 10000 / (10000 + rate_bp)); every present value is exact integer arithmetic with defined truncation. Rates and growth are basis points (10% -> 1000). ★FAIL-CLOSED ON THE DCF TRAP: the Gordon terminal value final*(1+g)/(r-g) EXPLODES to nonsense when growth >= discount rate (division by <=0). Analysts produce absurd trillion-dollar valuations exactly this way. dcf_terminal REFUSES (DCF_UNDEFINED) rather than emitting a garbage number. A valuation you cannot compute honestly is not a valuation. SCALE ENVELOPE (declared): cashflow * df fits i64 for cashflows up to ~9e12 units at df~1e6. DRY: composes nx_matter_lib helpers. license_tier: ORIGINAL No hw writes (Rule 26). LIB.