fix(wilderness): add seed diversity to Bloody Foothills obstacle placement

- Apply RNG jitter to obstacle placement coordinates and lengths across frontline zones
- Preserve the unblocked central corridor along y=24
- Track procedural walls and roads in siege topography stats
- Add unit test in tests/wilderness-siege-strips.test.ts verifying seed-based obstacle variance

TAG=agy
CONV=2a1934de-30ef-464e-b3f3-fcbcdbbc49f1

src/game/wilderness-siege.ts

@@ -416,34 +416,34 @@ export function stampAct5SiegeStrips(
   // Zone 1: West Frontline (x in [0, 80)) - High density (Shenk's stronghold)
   // -------------------------------------------------------------------------
   // Trenches (3 trenches)
-  totalTrenchCells += stampTrench(canvas, 18, 8, 10, 'vertical', rng)
+  totalTrenchCells += stampTrench(canvas, 18 + rng.int(-2, 2), 8 + rng.int(-1, 1), 10 + rng.int(-1, 1), 'vertical', rng)
-  totalTrenchCells += stampTrench(canvas, 50, 28, 10, 'vertical', rng)
+  totalTrenchCells += stampTrench(canvas, 50 + rng.int(-2, 2), 28 + rng.int(-1, 1), 10 + rng.int(-1, 1), 'vertical', rng)
-  totalTrenchCells += stampTrench(canvas, 34, 12, 7, 'horizontal', rng)
+  totalTrenchCells += stampTrench(canvas, 34 + rng.int(-2, 2), 12 + rng.int(-1, 1), 7 + rng.int(-1, 1), 'horizontal', rng)
   westObstacles += 3
 
   // Breached Barricades (3 barricades)
-  const b1 = stampBreachedBarricade(canvas, 26, 10, 24, 21, 5, rng)
+  const b1 = stampBreachedBarricade(canvas, 26 + rng.int(-2, 2), 10 + rng.int(-1, 1), 24, 21 + rng.int(0, 1), 5, rng)
   totalBarricadeWalls += b1.wallCount
   totalTrenchCells += b1.breachFloorCount
 
-  const b2 = stampBreachedBarricade(canvas, 42, 8, 12, 13, 3, rng)
+  const b2 = stampBreachedBarricade(canvas, 42 + rng.int(-2, 2), 8 + rng.int(-1, 1), 12, 13, 3, rng)
   totalBarricadeWalls += b2.wallCount
   totalTrenchCells += b2.breachFloorCount
 
-  const b3 = stampBreachedBarricade(canvas, 68, 26, 12, 31, 3, rng)
+  const b3 = stampBreachedBarricade(canvas, 68 + rng.int(-2, 2), 26 + rng.int(-1, 1), 12, 31, 3, rng)
   totalBarricadeWalls += b3.wallCount
   totalTrenchCells += b3.breachFloorCount
   westObstacles += 3
 
   // Catapult Platforms (2 platforms)
-  stampCatapultPlatform(canvas, 12, 10, 4, 4, rng)
+  stampCatapultPlatform(canvas, 12 + rng.int(-2, 2), 10 + rng.int(-1, 1), 4, 4, rng)
-  stampCatapultPlatform(canvas, 58, 30, 4, 4, rng)
+  stampCatapultPlatform(canvas, 58 + rng.int(-2, 2), 30 + rng.int(-1, 1), 4, 4, rng)
   catapultPlatformCount += 2
   westObstacles += 2
 
   // Fort Ruins (2 ruins)
-  stampFortRuin(canvas, 30, 30, 4, rng)
+  stampFortRuin(canvas, 30 + rng.int(-2, 2), 30 + rng.int(-1, 1), 4, rng)
-  stampFortRuin(canvas, 64, 10, 4, rng)
+  stampFortRuin(canvas, 64 + rng.int(-2, 2), 10 + rng.int(-1, 1), 4, rng)
   fortRuinCount += 2
   westObstacles += 2
 
@@ -451,27 +451,27 @@ export function stampAct5SiegeStrips(
   // Zone 2: Mid Field (x in [80, 160)) - Medium density (No-man's land)
   // -------------------------------------------------------------------------
   // Trenches (2 trenches)
-  totalTrenchCells += stampTrench(canvas, 98, 10, 10, 'vertical', rng)
+  totalTrenchCells += stampTrench(canvas, 98 + rng.int(-2, 2), 10 + rng.int(-1, 1), 10 + rng.int(-1, 1), 'vertical', rng)
-  totalTrenchCells += stampTrench(canvas, 138, 28, 10, 'vertical', rng)
+  totalTrenchCells += stampTrench(canvas, 138 + rng.int(-2, 2), 28 + rng.int(-1, 1), 10 + rng.int(-1, 1), 'vertical', rng)
   midObstacles += 2
 
   // Breached Barricades (2 barricades)
-  const b4 = stampBreachedBarricade(canvas, 114, 10, 24, 21, 5, rng)
+  const b4 = stampBreachedBarricade(canvas, 114 + rng.int(-2, 2), 10 + rng.int(-1, 1), 24, 21 + rng.int(0, 1), 5, rng)
   totalBarricadeWalls += b4.wallCount
   totalTrenchCells += b4.breachFloorCount
 
-  const b5 = stampBreachedBarricade(canvas, 146, 8, 12, 13, 3, rng)
+  const b5 = stampBreachedBarricade(canvas, 146 + rng.int(-2, 2), 8 + rng.int(-1, 1), 12, 13, 3, rng)
   totalBarricadeWalls += b5.wallCount
   totalTrenchCells += b5.breachFloorCount
   midObstacles += 2
 
   // Catapult Platforms (1 platform)
-  stampCatapultPlatform(canvas, 86, 30, 4, 4, rng)
+  stampCatapultPlatform(canvas, 86 + rng.int(-2, 2), 30 + rng.int(-1, 1), 4, 4, rng)
   catapultPlatformCount += 1
   midObstacles += 1
 
   // Fort Ruins (1 ruin)
-  stampFortRuin(canvas, 124, 10, 4, rng)
+  stampFortRuin(canvas, 124 + rng.int(-2, 2), 10 + rng.int(-1, 1), 4, rng)
   fortRuinCount += 1
   midObstacles += 1
 
@@ -479,11 +479,11 @@ export function stampAct5SiegeStrips(
   // Zone 3: East Rear (x in [160, 240)) - Low density (Harrogath outskirts)
   // -------------------------------------------------------------------------
   // Trenches (1 trench)
-  totalTrenchCells += stampTrench(canvas, 186, 12, 10, 'vertical', rng)
+  totalTrenchCells += stampTrench(canvas, 186 + rng.int(-2, 2), 12 + rng.int(-1, 1), 10 + rng.int(-1, 1), 'vertical', rng)
   eastObstacles += 1
 
   // Breached Barricades (1 barricade)
-  const b6 = stampBreachedBarricade(canvas, 202, 10, 24, 21, 5, rng)
+  const b6 = stampBreachedBarricade(canvas, 202 + rng.int(-2, 2), 10 + rng.int(-1, 1), 24, 21 + rng.int(0, 1), 5, rng)
   totalBarricadeWalls += b6.wallCount
   totalTrenchCells += b6.breachFloorCount
   eastObstacles += 1
@@ -491,7 +491,7 @@ export function stampAct5SiegeStrips(
   // Catapult Platforms (0 platforms in rear reserve)
 
   // Fort Ruins (1 ruin)
-  stampFortRuin(canvas, 170, 30, 4, rng)
+  stampFortRuin(canvas, 170 + rng.int(-2, 2), 30 + rng.int(-1, 1), 4, rng)
   fortRuinCount += 1
   eastObstacles += 1
 
@@ -510,6 +510,8 @@ export function stampAct5SiegeStrips(
   }
 
   stats.siegeTopography = siegeStats
+  stats.proceduralWallCells = (stats.proceduralWallCells ?? 0) + totalBarricadeWalls
+  stats.proceduralRoadCells = (stats.proceduralRoadCells ?? 0) + totalTrenchCells
   stats.notes.push('generated dynamic siege trenches and fortifications')
 
   return placed

tests/wilderness-siege-strips.test.ts

@@ -415,4 +415,59 @@ describe("Act 5 Bloody Foothills Dynamic Siege Generation (DRLGOUTSIEGE)", () =>
     expect(notes).toContain("generated dynamic siege trenches and fortifications")
     expect(result.stats.siegeTopography).toBeDefined()
   })
+
+  test("generates varied obstacle layouts with different seeds (seed diversity)", () => {
+    const pieces = createMockSiegePieces()
+    const result1 = generateWilderness({
+      levelId: 110,
+      levelName: "Bloody Foothills",
+      levelTypeName: "Act 5 - Siege",
+      sizeX: 240,
+      sizeY: 48,
+      subType: -1,
+      subTheme: -1,
+      seed: 11001,
+      pieces,
+      substitutions: [],
+    })
+
+    const result2 = generateWilderness({
+      levelId: 110,
+      levelName: "Bloody Foothills",
+      levelTypeName: "Act 5 - Siege",
+      sizeX: 240,
+      sizeY: 48,
+      subType: -1,
+      subTheme: -1,
+      seed: 11002,
+      pieces,
+      substitutions: [],
+    })
+
+    // Collect obstacle wall coordinates for both seeds
+    const walls1 = new Set<string>()
+    const walls2 = new Set<string>()
+
+    for (let y = 0; y < result1.level.height; y += 1) {
+      for (let x = 0; x < result1.level.width; x += 1) {
+        if (result1.level.cells[y]![x]!.walls.some(w => !w.hidden && w.prop1 !== 0)) {
+          walls1.add(`${x},${y}`)
+        }
+        if (result2.level.cells[y]![x]!.walls.some(w => !w.hidden && w.prop1 !== 0)) {
+          walls2.add(`${x},${y}`)
+        }
+      }
+    }
+
+    // Both should have placed walls
+    expect(walls1.size).toBeGreaterThan(0)
+    expect(walls2.size).toBeGreaterThan(0)
+
+    // The obstacle coordinates must differ across different seeds
+    let diffCount = 0
+    for (const coord of walls1) {
+      if (!walls2.has(coord)) diffCount += 1
+    }
+    expect(diffCount).toBeGreaterThan(0)
+  })
 })