diff --git a/data/json/terrain.json b/data/json/terrain.json
index 4a68760..ded7715 100644
--- a/data/json/terrain.json
+++ b/data/json/terrain.json
@@ -1 +1 @@
-{"_comment":"Static land/water mask. SAILABLE WATER = the map's own PATHING MAP (data/extracted/war3map.wpm, bit 0x40 = no-water, 4x4 32u subcells per 128u tile, majority vote): the engine's truth for where ships could actually sail in the original. This REPLACES the minimap NON-BLUE colour key (~0.66 water), which over-watered: green 'shallow' paint is often visually-wet-but-UNSAILABLE, merging lanes the real map separates (owner-reported 2026-07-08: the NE lane must NOT merge into the east-edge lane; the wpm separates them). The wpm reads ~0.55 sailable over the playable crop and all 26 known anchors (HQs, harbours, spawns, lane waypoints) sit sailable. The ONLY additions on top of the raw wpm grid are MINIMAL 1-cell connectivity necks (so every shop + dock/spawn reaches the sea and the two bases stay water-connected) PLUS the two owner-approved WEST sail-around island moats (Swedish Lumber Mill, Goblin Potion Dealer: land core + thin 1-cell navigable ring + EXACTLY ONE entrance; deterministic post-step). water=true is ship-navigable. The OPTIONAL `depth` field (0=land,1=deep,2=shallow,3=pink) is additive render metadata the SIM IGNORES; the minimap colours band each FINAL water cell so a client paints the water shades like the original. Regenerate with: make terrain (tools/extractor/terrain.py; pure stdlib, reads wpm+w3e+PNG, no venv). yOrientation 'top-down' means rle row 0 is the NORTH (max-Y) edge.","source":"data/extracted/war3map.wpm (pathing map, bit 0x40=no-water; THE sailability authority) + data/extracted/war3map.w3e (grid geometry) + data/reference/war3mapMap.png (depth render metadata only)","target":"the original map's enforced ship-pathing (wpm no-water), cropped to the playable rectangle","rule":"water = wpm NOT-no-water majority over the 16 32u subcells per 128u tile, MINUS singleton speckle, PLUS minimal 1-cell connectivity necks (Dijkstra cost 1 water / 30 land) for shops, docks/spawns and base-to-base, PLUS the two carved WEST sail-around island moats (compact land core + thin 1-cell water ring + exactly one entrance) around the Swedish Lumber Mill and Goblin Potion Dealer shops. depth sub-classifies FINAL water cells from the minimap colours for RENDER only: DEEP (R-B>35 AND R>=G), PINK (R>150 AND B>120 AND R-G>15), else SHALLOW; a water cell whose pixels read land-blue falls back to SHALLOW.","playableBounds":{"minX":-5376.0,"minY":-7424.0,"maxX":4864.0,"maxY":6912.0},"bounds":{"minX":-5440.0,"minY":-7488.0,"maxX":4928.0,"maxY":6976.0},"cols":162,"rows":226,"cellSizeX":64.0,"cellSizeY":64.0,"yOrientation":"top-down","yOrientationNote":"rle row 0 = max-Y (north); last row = min-Y (south). col 0 = min-X (west). col=floor((x-minX)/cellSizeX), row=floor((maxY-y)/cellSizeY). The minimap is north-up; tiles are sampled at their world centers via the content-box registration, emit row 0 = north, matching sim isWater.","rleFormat":"water[r] = [leadingValue, run0, run1, ...]; runs alternate from leadingValue (0=land,1=water) and sum to cols.","depthRleFormat":"OPTIONAL render metadata, the sim IGNORES it. depth[r] = [value0, run0, value1, run1, ...] (explicit value per run; values 0=land, 1=deep, 2=shallow, 3=pink; runs sum to cols). depth[r][col]>0 IFF water[r][col]==1 (exactly consistent with the authoritative `water` mask). Carved necks/moats with no minimap colour emit as shallow (2).","waterFraction":0.513165,"validation":{"hqsOnWater":"2/2","harboursOnWater":"4/4","playerSpawnsOnWater":"12/12","lanes":["south-west: spawnWater=True connToEnemyHQ=True","south-east: spawnWater=True connToEnemyHQ=True","north-west: spawnWater=True connToEnemyHQ=True","north-east: spawnWater=True connToEnemyHQ=True"],"basesConnected":true,"shopsReachable":"16/16","shopReach":["Swedish Lumber Mill: reachable=True nearestSeaCells=1","Goblin Potion Dealer: reachable=True nearestSeaCells=1","Elven Library: reachable=True nearestSeaCells=0","Ship Wreck: reachable=True nearestSeaCells=0","Elven Library: reachable=True nearestSeaCells=4","Ale Brewery: reachable=True nearestSeaCells=2","Equipment Merchant: reachable=True nearestSeaCells=3","Heavy Weapons Merchant: reachable=True nearestSeaCells=2","Weapons Merchant: reachable=True nearestSeaCells=4","Equipment Merchant: reachable=True nearestSeaCells=2","Bill (Trade Master): reachable=True nearestSeaCells=3","Pirate Boat Merchant: reachable=True nearestSeaCells=0","Will (Trade Master): reachable=True nearestSeaCells=4","Weapons Merchant: reachable=True nearestSeaCells=2","Heavy Weapons Merchant: reachable=True nearestSeaCells=3","Goblin Bomb Shop: reachable=True nearestSeaCells=0"],"repairRegionsReachable":"2/2","repairRegionReach":["Repair_Station_South: reachable=True","Repair_Station_North: reachable=True"],"waterFraction":0.5132,"eastThirdWaterRun":"median=6.0 mean=8.56 count=568","bottomRightWaterRun":"median=5.0 mean=5.87 count=200","necks":{"basePlatformCellsAdded":1,"connectivityNeckCellsAdded":0,"shopNeckCellsAdded":4,"repairRegionNeckCellsAdded":0,"waterFractionBefore":0.5136,"waterFractionAfter":0.5137,"shopsReachable":"16/16","repairRegionsReachable":"2/2","singletonCellsDropped":0,"straddledChannelCellsRestored":0,"westIslandLoops":{"Swedish Lumber 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0,6,2,4,0,21,2,7,0,4,2,2,0,17],[0,29,2,1,1,7,2,6,1,11,2,2,1,2,2,4,0,8,2,3,0,8,2,5,1,16,2,1,0,4,2,6,0,19,2,7,0,16,2,2,0,5],[0,29,2,1,1,7,2,3,1,1,2,1,1,12,2,2,1,2,2,5,0,5,2,2,0,1,2,2,0,8,2,5,1,16,2,1,0,4,2,7,0,18,2,7,0,16,2,2,0,5],[0,29,2,2,1,7,2,1,1,15,2,8,0,1,2,4,1,6,2,2,0,6,2,5,1,16,2,15,0,15,2,7,0,16,2,2,0,5],[0,29,2,2,1,24,2,4,0,3,2,3,1,10,0,6,2,5,1,16,2,14,0,12,2,2,0,4,2,5,0,16,2,2,0,5],[0,29,2,2,1,24,2,4,0,3,2,2,1,12,2,1,0,4,2,5,1,16,2,5,0,18,2,5,0,4,2,2,0,1,2,4,0,10,2,10,0,1],[0,29,2,2,1,25,2,3,0,4,2,1,1,13,2,1,0,3,2,5,1,16,2,5,0,18,2,5,0,7,2,4,0,9,2,11,0,1],[0,27,2,5,1,24,2,3,0,4,2,1,1,13,2,8,1,16,2,5,1,1,0,18,2,6,0,8,2,2,0,9,2,12],[0,27,2,6,1,24,2,2,0,4,2,1,1,13,2,8,1,15,2,6,1,1,0,18,2,6,0,8,2,2,0,5,2,16],[0,27,2,6,1,23,2,2,1,1,0,4,2,1,1,13,0,1,2,6,1,15,2,7,1,2,2,1,0,16,2,6,0,8,2,2,0,4,2,7,0,9,2,1],[0,27,1,1,2,6,1,22,2,2,1,2,2,3,1,14,0,3,2,4,1,14,2,11,0,15,2,7,0,8,2,2,0,4,2,6,0,10,2,1],[0,27,1,1,2,6,1,22,2,2,1,2,2,3,1,14,0,3,2,3,1,15,2,8,0,1,2,8,0,9,2,7,0,8,2,9,0,13,2,1],[0,26,1,2,2,8,1,23,2,5,1,13,0,3,2,3,1,15,2,4,0,5,2,9,0,6,2,9,0,8,2,8,0,14,2,1],[0,21,2,2,1,4,2,4,0,7,1,20,2,2,0,11,1,6,0,3,2,3,1,16,2,3,0,7,2,7,0,6,2,8,1,1,0,10,2,5,0,9,2,7],[0,21,2,1,1,5,2,5,0,6,1,20,2,2,0,3,2,1,3,1,0,10,1,1,2,1,0,3,2,3,1,18,0,8,2,7,0,7,2,8,0,10,2,4,0,10,2,7],[0,21,1,6,2,5,0,6,1,19,2,3,0,17,2,5,1,10,2,1,1,8,2,4,0,5,2,7,0,6,2,12,0,16,2,11],[0,21,1,6,2,5,0,6,1,18,2,3,0,17,2,6,1,9,2,3,1,5,2,5,1,1,0,8,2,4,0,6,2,13,0,15,2,11],[0,23,1,5,2,4,0,5,2,1,1,18,2,3,0,17,2,6,1,8,2,5,1,4,2,6,0,9,2,13,0,6,2,4,0,12,2,7,0,6],[0,23,1,6,2,3,0,5,2,2,1,16,2,4,0,18,2,5,1,7,2,7,1,4,2,6,0,9,2,12,0,6,2,4,0,12,2,5,0,8],[0,23,1,6,2,10,1,16,2,4,0,18,2,4,1,8,2,9,1,2,2,3,1,3,0,9,2,10,0,8,2,6,0,8,2,7,0,8],[0,23,1,11,2,5,1,17,2,4,0,17,2,4,1,8,2,8,0,17,2,6,1,1,2,4,0,8,2,6,0,7,2,5,0,11],[0,25,1,10,2,3,1,18,2,4,0,17,2,4,1,11,2,1,0,21,2,4,0,16,2,5,0,4,2,8,0,11],[0,25,1,32,2,3,0,14,2,7,1,9,2,3,0,42,2,5,0,3,2,8,0,11],[0,25,1,4,0,3,1,25,2,5,0,2,2,17,1,8,2,4,0,45,2,9,0,15],[0,25,1,4,0,4,1,25,2,4,0,2,2,17,1,8,2,4,0,11,2,2,0,33,2,8,0,15],[0,2,2,11,0,12,1,2,0,7,1,25,2,3,1,2,2,9,1,1,2,7,1,8,2,4,0,11,2,2,0,34,2,7,0,10,2,5],[0,2,2,1,0,9,2,1,0,11,1,3,0,9,1,24,2,10,1,6,2,5,1,9,2,6,0,6,2,4,0,16,2,2,0,17,2,6,0,10,2,4,0,1],[0,2,2,1,0,9,2,1,0,11,1,1,3,2,0,9,2,1,1,23,2,9,1,7,2,5,1,10,2,6,0,4,2,6,0,15,2,2,0,38],[0,2,2,1,0,9,2,1,0,11,3,3,2,1,0,6,2,1,1,1,2,1,1,24,2,8,1,7,2,4,1,12,2,5,0,4,2,6,0,55],[0,2,2,1,0,9,2,1,0,10,1,1,2,10,1,2,2,2,1,27,2,4,1,2,2,4,1,1,2,4,1,13,2,2,0,6,2,8,0,18,2,4,0,24,2,1,0,6],[0,2,2,1,0,9,2,1,0,10,2,15,1,33,2,3,1,20,2,1,0,6,2,8,1,1,0,14,2,2,0,1,2,7,0,21,2,1,0,6],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,17,1,56,2,1,0,6,2,6,1,3,0,13,2,12,0,20,2,1,0,5,1,1],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,16,1,57,2,1,0,6,2,6,1,2,2,1,0,8,2,2,0,3,2,12,0,20,2,1,0,5,1,1],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,12,1,60,2,17,0,7,2,20,0,14,2,5,0,6],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,9,1,63,2,17,0,6,2,22,0,13,2,5,0,6],[0,2,2,1,1,3,3,3,2,4,0,8,2,9,1,64,2,16,0,5,2,16,1,1,2,6,0,13,2,5,0,6],[0,7,1,1,0,12,2,10,1,18,2,5,1,42,2,2,1,1,2,4,0,3,2,5,0,5,2,16,1,1,2,10,0,9,2,6,0,5],[0,7,1,1,2,4,0,8,2,9,1,11,0,2,1,6,2,5,1,46,2,3,0,4,2,6,1,2,2,10,1,2,2,4,0,5,2,4,1,4,0,6,2,8,0,5],[0,7,1,1,2,5,0,7,2,9,1,11,0,3,1,5,2,5,1,2,2,4,1,41,0,7,2,3,1,4,2,15,0,6,2,5,1,4,0,5,1,1,2,5,0,7],[0,7,1,1,2,5,0,4,2,11,1,12,0,3,1,1,2,2,1,2,2,5,1,2,2,5,1,40,0,8,2,2,1,3,2,6,0,3,2,5,0,10,2,7,0,5,1,1,2,4,0,8],[0,7,2,2,0,1,2,3,0,4,2,2,1,2,2,6,1,10,2,1,1,1,0,4,1,1,2,2,1,2,2,12,1,40,0,8,2,2,1,1,2,8,0,3,2,5,0,9,2,10,0,2,1,1,2,4,0,9],[3,1,1,2,0,6,2,10,1,3,2,5,1,8,2,3,0,9,2,15,1,38,0,8,2,4,0,3,2,4,0,3,2,5,0,9,2,11,1,3,2,3,0,9],[3,2,1,2,2,15,1,4,2,4,1,7,2,2,0,11,2,17,1,36,0,8,2,4,0,3,1,1,2,3,0,5,2,3,0,12,2,8,1,4,2,2,0,9],[2,19,1,6,2,3,1,5,2,3,0,11,2,18,1,32,0,1,1,2,0,7,2,5,0,3,1,2,0,7,2,7,0,8,2,8,1,4,0,11],[2,1,0,5,2,13,1,7,2,1,1,4,0,16,2,19,1,29,2,2,0,9,2,6,0,3,1,2,0,8,2,6,0,8,2,8,1,4,0,11],[2,1,0,5,2,8,0,4,2,1,1,3,0,2,1,6,0,28,2,16,1,6,0,7,1,4,0,15,2,6,0,15,2,6,0,29],[2,1,0,24,1,1,2,3,0,34,2,14,1,2,0,8,1,4,0,15,2,6,0,15,2,6,0,29],[0,25,2,2,0,36,2,15,1,1,0,27,2,6,0,15,2,6,0,29],[0,25,2,2,0,36,2,16,0,28,2,5,0,15,2,6,0,29],[0,63,2,16,0,28,2,6,0,14,2,8,0,27],[0,63,2,16,0,28,2,6,0,14,2,8,0,27],[0,63,2,16,0,29,2,9,0,8,2,4,0,33],[0,63,2,16,0,30,2,13,0,3,2,4,0,33],[0,63,2,20,0,29,2,17,0,33],[0,63,2,20,0,30,2,16,0,33],[0,55,3,1,2,29,0,29,2,6,0,42],[0,55,3,1,2,29,0,33,2,2,0,42],[0,55,3,1,2,29,0,33,2,1,1,1,0,42],[0,55,2,30,0,77],[0,59,2,8,0,4,2,1,0,90],[0,59,2,8,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,1,1,2,2,3,0,95],[0,63,3,2,0,97]]}
+{"_comment":"Static land/water mask. SAILABLE WATER = the map's own PATHING MAP (data/extracted/war3map.wpm, bit 0x40 = no-water, 4x4 32u subcells per 128u tile, majority vote): the engine's truth for where ships could actually sail in the original. This REPLACES the minimap NON-BLUE colour key (~0.66 water), which over-watered: green 'shallow' paint is often visually-wet-but-UNSAILABLE, merging lanes the real map separates (owner-reported 2026-07-08: the NE lane must NOT merge into the east-edge lane; the wpm separates them). The wpm reads ~0.55 sailable over the playable crop and all 26 known anchors (HQs, harbours, spawns, lane waypoints) sit sailable. The ONLY additions on top of the raw wpm grid are MINIMAL 1-cell connectivity necks (so every shop + dock/spawn reaches the sea and the two bases stay water-connected) PLUS the two owner-approved WEST sail-around island moats (Swedish Lumber Mill, Goblin Potion Dealer: land core + thin 1-cell navigable ring + EXACTLY ONE entrance; deterministic post-step). water=true is ship-navigable. The OPTIONAL `depth` field (0=land,1=deep,2=shallow,3=pink) is additive render metadata the SIM IGNORES; the minimap colours band each FINAL water cell so a client paints the water shades like the original. Regenerate with: make terrain (tools/extractor/terrain.py; pure stdlib, reads wpm+w3e+PNG, no venv). yOrientation 'top-down' means rle row 0 is the NORTH (max-Y) edge.","source":"data/extracted/war3map.wpm (pathing map, bit 0x40=no-water; THE sailability authority) + data/extracted/war3map.w3e (grid geometry) + data/reference/war3mapMap.png (depth render metadata only)","target":"the original map's enforced ship-pathing (wpm no-water), cropped to the playable rectangle","rule":"water = wpm NOT-no-water majority over the 16 32u subcells per 128u tile, MINUS singleton speckle, PLUS minimal 1-cell connectivity necks (Dijkstra cost 1 water / 30 land) for shops, docks/spawns and base-to-base, PLUS the two carved WEST sail-around island moats (compact land core + thin 1-cell water ring + exactly one entrance) around the Swedish Lumber Mill and Goblin Potion Dealer shops. depth sub-classifies FINAL water cells from the minimap colours for RENDER only: DEEP (R-B>35 AND R>=G), PINK (R>150 AND B>120 AND R-G>15), else SHALLOW; a water cell whose pixels read land-blue falls back to SHALLOW.","playableBounds":{"minX":-5376.0,"minY":-7424.0,"maxX":4864.0,"maxY":6912.0},"bounds":{"minX":-5440.0,"minY":-7488.0,"maxX":4928.0,"maxY":6976.0},"cols":162,"rows":226,"cellSizeX":64.0,"cellSizeY":64.0,"yOrientation":"top-down","yOrientationNote":"rle row 0 = max-Y (north); last row = min-Y (south). col 0 = min-X (west). col=floor((x-minX)/cellSizeX), row=floor((maxY-y)/cellSizeY). The minimap is north-up; tiles are sampled at their world centers via the content-box registration, emit row 0 = north, matching sim isWater.","rleFormat":"water[r] = [leadingValue, run0, run1, ...]; runs alternate from leadingValue (0=land,1=water) and sum to cols.","depthRleFormat":"OPTIONAL render metadata, the sim IGNORES it. depth[r] = [value0, run0, value1, run1, ...] (explicit value per run; values 0=land, 1=deep, 2=shallow, 3=pink; runs sum to cols). depth[r][col]>0 IFF water[r][col]==1 (exactly consistent with the authoritative `water` mask). Carved necks/moats with no minimap colour emit as shallow (2).","waterFraction":0.51311,"validation":{"hqsOnWater":"2/2","harboursOnWater":"4/4","playerSpawnsOnWater":"12/12","lanes":["south-west: spawnWater=True connToEnemyHQ=True","south-east: spawnWater=True connToEnemyHQ=True","north-west: spawnWater=True connToEnemyHQ=True","north-east: spawnWater=True connToEnemyHQ=True"],"basesConnected":true,"shopsReachable":"16/16","shopReach":["Swedish Lumber Mill: reachable=True nearestSeaCells=1","Goblin Potion Dealer: reachable=True nearestSeaCells=1","Elven Library: reachable=True nearestSeaCells=0","Ship Wreck: reachable=True nearestSeaCells=0","Elven Library: reachable=True nearestSeaCells=4","Ale Brewery: reachable=True nearestSeaCells=2","Equipment Merchant: reachable=True nearestSeaCells=3","Heavy Weapons Merchant: reachable=True nearestSeaCells=2","Weapons Merchant: reachable=True nearestSeaCells=4","Equipment Merchant: reachable=True nearestSeaCells=2","Bill (Trade Master): reachable=True nearestSeaCells=3","Pirate Boat Merchant: reachable=True nearestSeaCells=0","Will (Trade Master): reachable=True nearestSeaCells=4","Weapons Merchant: reachable=True nearestSeaCells=2","Heavy Weapons Merchant: reachable=True nearestSeaCells=3","Goblin Bomb Shop: reachable=True nearestSeaCells=0"],"repairRegionsReachable":"2/2","repairRegionReach":["Repair_Station_South: reachable=True","Repair_Station_North: reachable=True"],"waterFraction":0.5131,"eastThirdWaterRun":"median=6.0 mean=8.57 count=567","bottomRightWaterRun":"median=5.0 mean=5.87 count=200","necks":{"basePlatformCellsAdded":1,"connectivityNeckCellsAdded":0,"shopNeckCellsAdded":4,"repairRegionNeckCellsAdded":0,"waterFractionBefore":0.5136,"waterFractionAfter":0.5137,"shopsReachable":"16/16","repairRegionsReachable":"2/2","singletonCellsDropped":0,"straddledChannelCellsRestored":0,"ownerLaneGates":[{"gate":"north-most lane: east leg (owner's 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2,7,0,4,2,2,0,17],[0,29,2,1,1,7,2,6,1,11,2,2,1,2,2,4,0,8,2,3,0,8,2,5,1,16,2,1,0,4,2,6,0,19,2,7,0,16,2,2,0,5],[0,29,2,1,1,7,2,3,1,1,2,1,1,12,2,2,1,2,2,5,0,5,2,2,0,1,2,2,0,8,2,5,1,16,2,1,0,4,2,7,0,18,2,7,0,16,2,2,0,5],[0,29,2,2,1,7,2,1,1,15,2,8,0,1,2,4,1,6,2,2,0,6,2,5,1,16,2,15,0,15,2,7,0,16,2,2,0,5],[0,29,2,2,1,24,2,4,0,3,2,3,1,10,0,6,2,5,1,16,2,14,0,12,2,2,0,4,2,5,0,16,2,2,0,5],[0,29,2,2,1,24,2,4,0,3,2,2,1,12,2,1,0,4,2,5,1,16,2,5,0,18,2,5,0,4,2,2,0,1,2,4,0,10,2,10,0,1],[0,29,2,2,1,25,2,3,0,4,2,1,1,13,2,1,0,3,2,5,1,16,2,5,0,18,2,5,0,7,2,4,0,9,2,11,0,1],[0,27,2,5,1,24,2,3,0,4,2,1,1,13,2,8,1,16,2,5,1,1,0,18,2,6,0,8,2,2,0,9,2,12],[0,27,2,6,1,24,2,2,0,4,2,1,1,13,2,8,1,15,2,6,1,1,0,18,2,6,0,8,2,2,0,5,2,16],[0,27,2,6,1,23,2,2,1,1,0,4,2,1,1,13,0,1,2,6,1,15,2,7,1,2,2,1,0,16,2,6,0,8,2,2,0,4,2,7,0,9,2,1],[0,27,1,1,2,6,1,22,2,2,1,2,2,3,1,14,0,3,2,4,1,14,2,11,0,15,2,7,0,8,2,2,0,4,2,6,0,10,2,1],[0,27,1,1,2,6,1,22,2,2,1,2,2,3,1,14,0,3,2,3,1,15,2,8,0,1,2,8,0,9,2,7,0,8,2,9,0,13,2,1],[0,26,1,2,2,8,1,23,2,5,1,13,0,3,2,3,1,15,2,4,0,5,2,9,0,6,2,9,0,8,2,8,0,14,2,1],[0,21,2,2,1,4,2,4,0,7,1,20,2,2,0,11,1,6,0,3,2,3,1,16,2,3,0,7,2,7,0,6,2,8,1,1,0,10,2,5,0,9,2,7],[0,21,2,1,1,5,2,5,0,6,1,20,2,2,0,3,2,1,3,1,0,10,1,1,2,1,0,3,2,3,1,18,0,8,2,7,0,7,2,8,0,10,2,4,0,10,2,7],[0,21,1,6,2,5,0,6,1,19,2,3,0,17,2,5,1,10,2,1,1,8,2,4,0,5,2,7,0,6,2,12,0,16,2,11],[0,21,1,6,2,5,0,6,1,18,2,3,0,17,2,6,1,9,2,3,1,5,2,5,1,1,0,8,2,4,0,6,2,13,0,15,2,11],[0,23,1,5,2,4,0,5,2,1,1,18,2,3,0,17,2,6,1,8,2,5,1,4,2,6,0,9,2,13,0,6,2,4,0,12,2,7,0,6],[0,23,1,6,2,3,0,5,2,2,1,16,2,4,0,18,2,5,1,7,2,7,1,4,2,6,0,9,2,12,0,6,2,4,0,12,2,5,0,8],[0,23,1,6,2,10,1,16,2,4,0,18,2,4,1,8,2,9,1,2,2,3,1,3,0,9,2,10,0,8,2,6,0,8,2,7,0,8],[0,23,1,11,2,5,1,17,2,4,0,17,2,4,1,8,2,8,0,17,2,6,1,1,2,4,0,8,2,6,0,7,2,5,0,11],[0,25,1,10,2,3,1,18,2,4,0,17,2,4,1,11,2,1,0,21,2,4,0,16,2,5,0,4,2,8,0,11],[0,25,1,32,2,3,0,14,2,7,1,9,2,3,0,42,2,5,0,3,2,8,0,11],[0,25,1,4,0,3,1,25,2,5,0,2,2,17,1,8,2,4,0,45,2,9,0,15],[0,25,1,4,0,4,1,25,2,4,0,2,2,17,1,8,2,4,0,11,2,2,0,33,2,8,0,15],[0,2,2,11,0,12,1,2,0,7,1,25,2,3,1,2,2,9,1,1,2,7,1,8,2,4,0,11,2,2,0,34,2,7,0,10,2,5],[0,2,2,1,0,9,2,1,0,11,1,3,0,9,1,24,2,10,1,6,2,5,1,9,2,6,0,6,2,4,0,16,2,2,0,17,2,6,0,10,2,4,0,1],[0,2,2,1,0,9,2,1,0,11,1,1,3,2,0,9,2,1,1,23,2,9,1,7,2,5,1,10,2,6,0,4,2,6,0,15,2,2,0,38],[0,2,2,1,0,9,2,1,0,11,3,3,2,1,0,6,2,1,1,1,2,1,1,24,2,8,1,7,2,4,1,12,2,5,0,4,2,6,0,55],[0,2,2,1,0,9,2,1,0,10,1,1,2,10,1,2,2,2,1,27,2,4,1,2,2,4,1,1,2,4,1,13,2,2,0,6,2,8,0,18,2,4,0,24,2,1,0,6],[0,2,2,1,0,9,2,1,0,10,2,15,1,33,2,3,1,20,2,1,0,6,2,8,1,1,0,14,2,2,0,1,2,7,0,21,2,1,0,6],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,17,1,56,2,1,0,6,2,6,1,3,0,13,2,12,0,20,2,1,0,5,1,1],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,16,1,57,2,1,0,6,2,6,1,2,2,1,0,8,2,2,0,3,2,12,0,20,2,1,0,5,1,1],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,12,1,60,2,17,0,7,2,20,0,14,2,5,0,6],[0,2,2,1,0,9,2,1,0,1,2,1,0,6,2,9,1,63,2,17,0,6,2,22,0,13,2,5,0,6],[0,2,2,1,1,3,3,3,2,4,0,8,2,9,1,64,2,16,0,5,2,16,1,1,2,6,0,13,2,5,0,6],[0,7,1,1,0,12,2,10,1,18,2,5,1,42,2,2,1,1,2,4,0,3,2,5,0,5,2,16,1,1,2,10,0,9,2,6,0,5],[0,7,1,1,2,4,0,8,2,9,1,11,0,2,1,6,2,5,1,46,2,3,0,4,2,6,1,2,2,10,1,2,2,4,0,5,2,4,1,4,0,6,2,8,0,5],[0,7,1,1,2,5,0,7,2,9,1,11,0,3,1,5,2,5,1,2,2,4,1,41,0,7,2,3,1,4,2,15,0,6,2,5,1,4,0,5,1,1,2,5,0,7],[0,7,1,1,2,5,0,4,2,11,1,12,0,3,1,1,2,2,1,2,2,5,1,2,2,5,1,40,0,8,2,2,1,3,2,6,0,3,2,5,0,10,2,7,0,5,1,1,2,4,0,8],[0,7,2,2,0,1,2,3,0,4,2,2,1,2,2,6,1,10,2,1,1,1,0,4,1,1,2,2,1,2,2,12,1,40,0,8,2,2,1,1,2,8,0,3,2,5,0,9,2,10,0,2,1,1,2,4,0,9],[3,1,1,2,0,6,2,10,1,3,2,5,1,8,2,3,0,9,2,15,1,38,0,8,2,4,0,3,2,4,0,3,2,5,0,9,2,11,1,3,2,3,0,9],[3,2,1,2,2,15,1,4,2,4,1,7,2,2,0,11,2,17,1,36,0,8,2,4,0,3,1,1,2,3,0,5,2,3,0,12,2,8,1,4,2,2,0,9],[2,19,1,6,2,3,1,5,2,3,0,11,2,18,1,32,0,1,1,2,0,7,2,5,0,3,1,2,0,7,2,7,0,8,2,8,1,4,0,11],[2,1,0,5,2,13,1,7,2,1,1,4,0,16,2,19,1,29,2,2,0,9,2,6,0,3,1,2,0,8,2,6,0,8,2,8,1,4,0,11],[2,1,0,5,2,8,0,4,2,1,1,3,0,2,1,6,0,28,2,16,1,6,0,7,1,4,0,15,2,6,0,15,2,6,0,29],[2,1,0,24,1,1,2,3,0,34,2,14,1,2,0,8,1,4,0,15,2,6,0,15,2,6,0,29],[0,25,2,2,0,36,2,15,1,1,0,27,2,6,0,15,2,6,0,29],[0,25,2,2,0,36,2,16,0,28,2,5,0,15,2,6,0,29],[0,63,2,16,0,28,2,6,0,14,2,8,0,27],[0,63,2,16,0,28,2,6,0,14,2,8,0,27],[0,63,2,16,0,29,2,9,0,8,2,4,0,33],[0,63,2,16,0,30,2,13,0,3,2,4,0,33],[0,63,2,20,0,29,2,17,0,33],[0,63,2,20,0,30,2,16,0,33],[0,55,3,1,2,29,0,29,2,6,0,42],[0,55,3,1,2,29,0,33,2,2,0,42],[0,55,3,1,2,29,0,33,2,1,1,1,0,42],[0,55,2,30,0,77],[0,59,2,8,0,4,2,1,0,90],[0,59,2,8,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,6,0,95],[0,61,2,1,1,2,2,3,0,95],[0,63,3,2,0,97]]}
diff --git a/docs/SEMANTICS.md b/docs/SEMANTICS.md
index 11d5fb5..61c322e 100644
--- a/docs/SEMANTICS.md
+++ b/docs/SEMANTICS.md
@@ -578,3 +578,35 @@ These never fire in default NormalPlay, so the solo-vs-AI match loop is unaffect
 5. **Morph HP carryover** on Dive (fraction vs flat) (§5).
 6. **Ghost reveal-during-cast** exact window for H00W torpedo use (§5).
 7. **Asid absence on shop base units** — confirm during SLK extraction (§8).
+
+## Owner-directed map divergence: the north-most lane's east leg (2026-07-09)
+
+The north-most lane is a HORSESHOE — a top band whose two legs drop to the
+middle sea. The owner (a former competitive BSP player) reported, pointing at
+the spot on the original minimap: *"the lanes up north do not touch they are
+separate"*, *"you would need to enter by the spawn to get to the north most
+lane"*, and of the west side, *"you could get by without the harbor seeing you
+on both north and south"*.
+
+`terrain.py` `OWNER_LANE_GATES` therefore blocks the narrowest row of the EAST
+leg only. The WEST leg is left open: it is the way round from the bot-spawn
+harbour and the sneak-past the owner describes.
+
+**Likely original mechanism — a waterfall.** WC3 terrain is terraced and a unit
+may only change cliff layer on a RAMP. The north lane sits on layer 3 and the
+middle sea on layer 2, so a waterfall is exactly what belongs where they meet.
+`war3map.wpm` cannot express it: it stores each cell's own passability, never
+the STEP between two cells.
+
+**Why the terrace rule is not applied globally** (measured, not assumed): the
+layer-2/3 line runs through the whole map's water. Blocking every narrow
+(<=128u) non-ramp crossing of it would close **223 sites / 3,740 subcells** and
+shred the map. A one-sided "block the lip on the higher terrace" variant was
+also built and measured: it held every fidelity gate but did NOT isolate the
+lane at emit resolution. Both were reverted; only the owner-identified choke is
+gated.
+
+**Measured effect:** east-side lane -> north-most lane 2080u -> 3328u (must go
+round), while bot-spawn harbour -> north-most lane is UNCHANGED at 3200u. All
+fidelity gates still pass (16/16 shops sea-reachable, bases connected, G6 lane
+topology 0 mismatches).
diff --git a/tools/extractor/terrain.py b/tools/extractor/terrain.py
index f1cede6..e2334ba 100644
--- a/tools/extractor/terrain.py
+++ b/tools/extractor/terrain.py
@@ -1205,6 +1205,61 @@ def cell_labels(c: int, r: int) -> set[int]:
     return flipped
 
 
+OWNER_LANE_GATES: tuple[tuple[float, float, float, float, str], ...] = (
+    # OWNER-DIRECTED DIVERGENCE (2026-07-09), from the owner -- a former
+    # competitive BSP player -- pointing at the spot on the original minimap:
+    # "the lanes up north do not touch they are separate", "you would need to
+    # enter by the spawn to get to the north most lane", and of the WEST side,
+    # "you could get by without the harbor seeing you on both north and south".
+    #
+    # The north-most lane is a HORSESHOE: a top band whose two legs drop to the
+    # middle sea. The WEST leg is legitimate -- it is the way round from the
+    # bot-spawn harbour, and the sneak past it the owner describes. The EAST
+    # leg is the one the arrow marks: it lets a ship step straight off the
+    # east-side lane into the north-most lane, which is why the lanes "touch".
+    #
+    # Likely original mechanism: a WATERFALL. The north lane sits on cliff
+    # layer 3, the middle sea on layer 2, and WC3 units cannot cross a terrace
+    # step except on a ramp -- a drop war3map.wpm cannot express, since it
+    # stores each cell's own passability and never the step between two cells.
+    # (The general terrace rule was implemented and measured: it held every
+    # gate but did not isolate the lane at emit resolution, so we close the one
+    # channel the owner identified rather than reshape 2000+ cells on an
+    # unproven rule.) Measured effect: east-lane -> north-most lane goes
+    # 2080u -> 3328u (round the long way), while harbour -> north-most lane is
+    # UNCHANGED at 3200u. Documented in docs/SEMANTICS.md.
+    #
+    # Each entry is a SEARCH BOX; the narrowest sailable row inside it is what
+    # gets blocked, so the gate lands on the true choke, not a hand-drawn wall.
+    (3600.0, 3900.0, 5250.0, 5560.0, "north-most lane: east leg (owner's arrow)"),
+)
+
+
+def close_owner_lane_gates(rows: list[list[int]], geom: dict) -> list[dict]:
+    """Block the narrowest sailable row inside each OWNER_LANE_GATES box (see
+    the table for why each one exists)."""
+    report: list[dict] = []
+    for x0, x1, y0, y1, label in OWNER_LANE_GATES:
+        c0, r1 = cell_for(x0, y0, geom)
+        c1, r0 = cell_for(x1, y1, geom)
+        best: tuple[int, list[int]] | None = None
+        for r in range(min(r0, r1), max(r0, r1) + 1):
+            open_cells = [c for c in range(min(c0, c1), max(c0, c1) + 1) if rows[r][c]]
+            if not open_cells:
+                continue
+            if best is None or len(open_cells) < len(best[1]):
+                best = (r, open_cells)
+        if best is None:
+            report.append({"gate": label, "blocked": 0, "note": "no sailable row in box"})
+            continue
+        r, cells = best
+        for c in cells:
+            rows[r][c] = 0
+        report.append({"gate": label, "row": r, "blocked": len(cells),
+                       "widthUnits": len(cells) * int(geom["csx"])})
+    return report
+
+
 def lane_topology_gate(rows: list[list[int]], wpm: dict, layout: dict, geom: dict,
                        map_min_x: float, map_min_y: float) -> dict:
     """G6 (hard gate): the emitted grid must preserve the FULL-RES lane
@@ -1913,6 +1968,13 @@ def main() -> None:
     # NON-BLUE key the green shallow water already RINGS the blue ridge cores, so
     # the sail-around loops largely emerge naturally; this step only guarantees the
     # closed single-entrance moat the owner wants around the two shop cores.
+    # OWNER-DIRECTED lane gate (see OWNER_LANE_GATES): close the east leg of
+    # the north-most lane's horseshoe. AFTER the connectivity carve so it is
+    # not re-opened; the gates below re-verify every shop/base is still
+    # reachable, and G6's anchor set is unaffected (no anchor is stranded).
+    gate_report = close_owner_lane_gates(rows, geom)
+    neck_report["ownerLaneGates"] = gate_report
+
     rows_before_loops = [list(r) for r in rows]  # snapshot for the westloop compare
     west_island_report = carve_west_island_loops(rows, layout, geom)
     neck_report["westIslandLoops"] = west_island_report