Create-Voidway

Portal train tracks

Fixed portal-block mapping failing on portals at negative X/Z (e.g. z < 0), which blocked track linking even for matching 3×3 openings. Added clearer [VoidPortalTrack] log reasons when findExit fails. Portal pairing / frequency

A portal only occupies its frequency while it can still run: valid frame, frequency set, transfer fluid present, and a live stress input. Breaking the frame, emptying fluid, or disconnecting stress drops it from the pair so another portal can take the slot (e.g. free A so B can link with C). Overstress alone does not drop frequency occupancy (avoids pair flicker when link stress demand applies); the portal still stays inactive until stress is healthy.