Make ice coolant an actual ongoing cost, not just a stockpile check

Add ice coolant efficiency and a 5% paused-power trickle

Economy: cache the per-tick power throttle, fix a false doc comment, dedup a survey

AI logistics: true symmetry — the AI hauls its own industry, no more free treasury

AI industry (1/N): abstracted AI logistics — factories & rigs run off the treasury

Plasma Rig: surface deposits telegraph the seam below (educated-guess placement)

Logistics Phase A: finite rig output buffer + worker haulage

Plasma Rig: deep-core extraction — unlimited raws at a probabilistic yield tier