diff --git a/.gitignore b/.gitignore
index b6004f5..4e26865 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,16 @@ launch-*.log
 launch.utf8.log
 n4-verify*.log
 
+# A6.P5 (2026-05-25) — door-stuck reproduction captures (multi-MB);
+# the 3-record fixture extracted from these lives at
+# tests/AcDream.Core.Tests/Fixtures/door-bug/over-penetration-capture.jsonl
+door-stuck-capture.jsonl
+door-stuck-*.launch.log
+door-stuck-*.launch.utf8.log
+door-fix-*.launch.log
+door-fix-*.jsonl
+door-walkthrough.*
+
 # ImGui auto-saved window/docking state (per-user, not source)
 imgui.ini
 
diff --git a/tests/AcDream.Core.Tests/Fixtures/door-bug/over-penetration-capture.jsonl b/tests/AcDream.Core.Tests/Fixtures/door-bug/over-penetration-capture.jsonl
new file mode 100644
index 0000000..3d05baa
--- /dev/null
+++ b/tests/AcDream.Core.Tests/Fixtures/door-bug/over-penetration-capture.jsonl
@@ -0,0 +1,3 @@
+{"tick":3630,"timestampMs":15362446,"input":{"currentPos":{"x":132.5935,"y":16.350428,"z":94},"targetPos":{"x":132.4014,"y":16.761757,"z":94},"cellId":2847146303,"sphereRadius":0.48,"sphereHeight":1.2,"stepUpHeight":0.6,"stepDownHeight":1.5,"isOnGround":true,"moverFlags":768,"movingEntityId":1000000},"bodyBefore":{"position":{"x":132.4014,"y":16.761757,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.21672896,"w":0.9762318},"velocity":{"x":-5.0136037,"y":10.735089,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":0,"y":0,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":0,"z":1},"d":-94},"contactPlaneCellId":2847146303,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":0,"z":1},"d":-94},"walkableVertices":[{"x":124.52,"y":16.5,"z":94},{"x":126.9,"y":14.3,"z":94},{"x":133.9,"y":14.299999,"z":94},{"x":136.3,"y":16.5,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":131,"lastUpdateTime":0},"result":{"position":{"x":132.4014,"y":16.761757,"z":94},"cellId":2847146320,"isOnGround":true,"collisionNormalValid":false,"collisionNormal":{"x":0,"y":0,"z":0}},"bodyAfter":{"position":{"x":132.4014,"y":16.761757,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.21672896,"w":0.9762318},"velocity":{"x":-5.0136037,"y":10.735089,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":0,"y":0,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"contactPlaneCellId":2847146025,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"walkableVertices":[{"x":144,"y":0,"z":94},{"x":144,"y":24,"z":94},{"x":120,"y":24,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":131,"lastUpdateTime":0}}
+{"tick":3636,"timestampMs":15362481,"input":{"currentPos":{"x":132.4014,"y":16.761757,"z":94},"targetPos":{"x":132.19926,"y":17.116356,"z":94},"cellId":2847146320,"sphereRadius":0.48,"sphereHeight":1.2,"stepUpHeight":0.6,"stepDownHeight":1.5,"isOnGround":true,"moverFlags":768,"movingEntityId":1000000},"bodyBefore":{"position":{"x":132.19926,"y":17.116356,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.25616026,"w":0.96663433},"velocity":{"x":-5.867513,"y":10.293234,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":0,"y":0,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"contactPlaneCellId":2847146025,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"walkableVertices":[{"x":144,"y":0,"z":94},{"x":144,"y":24,"z":94},{"x":120,"y":24,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":131,"lastUpdateTime":0},"result":{"position":{"x":132.4014,"y":16.761757,"z":94},"cellId":2847146320,"isOnGround":true,"collisionNormalValid":true,"collisionNormal":{"x":-0.9999022,"y":0.013985067,"z":0}},"bodyAfter":{"position":{"x":132.19926,"y":17.116356,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.25616026,"w":0.96663433},"velocity":{"x":-5.867513,"y":10.293234,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":-0.99990225,"y":0.013985068,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"contactPlaneCellId":2847146025,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"walkableVertices":[{"x":144,"y":0,"z":94},{"x":144,"y":24,"z":94},{"x":120,"y":24,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":135,"lastUpdateTime":0}}
+{"tick":3631,"timestampMs":15362452,"input":{"currentPos":{"x":132.4014,"y":16.761757,"z":94},"targetPos":{"x":132.4014,"y":16.761757,"z":94},"cellId":2847146320,"sphereRadius":0.48,"sphereHeight":1.2,"stepUpHeight":0.6,"stepDownHeight":1.5,"isOnGround":true,"moverFlags":768,"movingEntityId":1000000},"bodyBefore":{"position":{"x":132.4014,"y":16.761757,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.22556531,"w":0.974228},"velocity":{"x":-5.207305,"y":10.642477,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":0,"y":0,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"contactPlaneCellId":2847146025,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"walkableVertices":[{"x":144,"y":0,"z":94},{"x":144,"y":24,"z":94},{"x":120,"y":24,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":131,"lastUpdateTime":0},"result":{"position":{"x":132.4014,"y":16.761757,"z":94},"cellId":2847146320,"isOnGround":true,"collisionNormalValid":false,"collisionNormal":{"x":0,"y":0,"z":0}},"bodyAfter":{"position":{"x":132.4014,"y":16.761757,"z":94},"orientation":{"isIdentity":false,"x":0,"y":0,"z":0.22556531,"w":0.974228},"velocity":{"x":-5.207305,"y":10.642477,"z":0},"acceleration":{"x":0,"y":0,"z":0},"omega":{"x":0,"y":0,"z":0},"groundNormal":{"x":0,"y":0,"z":1},"slidingNormal":{"x":0,"y":0,"z":0},"contactPlaneValid":true,"contactPlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"contactPlaneCellId":2847146025,"contactPlaneIsWater":false,"walkablePolygonValid":true,"walkablePlane":{"normal":{"x":0,"y":-0,"z":1},"d":-94},"walkableVertices":[{"x":144,"y":0,"z":94},{"x":144,"y":24,"z":94},{"x":120,"y":24,"z":94}],"walkableUp":{"x":0,"y":0,"z":1},"elasticity":0.05,"friction":0.95,"state":1040,"transientState":131,"lastUpdateTime":0}}
diff --git a/tools/jsonl/extract-records.ps1 b/tools/jsonl/extract-records.ps1
new file mode 100644
index 0000000..6458bf4
--- /dev/null
+++ b/tools/jsonl/extract-records.ps1
@@ -0,0 +1,64 @@
+# A6.P5 fixture builder — pull the 3 representative records from the live
+# capture into the test fixture. One-shot; gitignored fixture path.
+param(
+    [string]$Source = 'door-stuck-capture.jsonl',
+    [string]$Out    = 'tests/AcDream.Core.Tests/Fixtures/door-bug/over-penetration-capture.jsonl'
+)
+
+$ErrorActionPreference = 'Stop'
+$outDir = Split-Path -Parent $Out
+if (-not (Test-Path $outDir)) { New-Item -ItemType Directory -Force -Path $outDir | Out-Null }
+
+# We need exactly three records:
+#   A) The over-penetration tick: cellId 2847146303, currentPos.Y ~16.35,
+#      targetPos.Y ~16.76 — the resolve that committed the over-penetration.
+#   B) A stuck-position hit=yes tick: cellId 2847146320, currentPos at
+#      (132.401, 16.762, 94), resultCollisionNormalValid=true.
+#   C) A stuck-position hit=no tick: cellId 2847146320, same currentPos,
+#      resultCollisionNormalValid=false.
+
+$records = Get-Content -LiteralPath $Source -Encoding UTF8 |
+    ForEach-Object {
+        if ([string]::IsNullOrWhiteSpace($_)) { return }
+        $obj = $_ | ConvertFrom-Json
+        $obj | Add-Member -NotePropertyName _raw -NotePropertyValue $_
+        $obj
+    }
+
+# A — over-penetration tick: input cell 2847146303, output cell 2847146320,
+# target Y >~16.7, result position approx == target (not blocked).
+$overpen = $records |
+    Where-Object {
+        $_.input.cellId -eq 2847146303 -and
+        $_.result.cellId -eq 2847146320 -and
+        $_.input.targetPos.y -gt 16.7 -and
+        [Math]::Abs($_.result.position.y - $_.input.targetPos.y) -lt 0.01
+    } |
+    Select-Object -First 1
+
+# B — stuck-position hit=yes
+$stuckHit = $records |
+    Where-Object {
+        $_.input.cellId -eq 2847146320 -and
+        [Math]::Abs($_.input.currentPos.x - 132.401) -lt 0.001 -and
+        [Math]::Abs($_.input.currentPos.y - 16.762) -lt 0.001 -and
+        $_.result.collisionNormalValid
+    } |
+    Select-Object -First 1
+
+# C — stuck-position hit=no
+$stuckMiss = $records |
+    Where-Object {
+        $_.input.cellId -eq 2847146320 -and
+        [Math]::Abs($_.input.currentPos.x - 132.401) -lt 0.001 -and
+        [Math]::Abs($_.input.currentPos.y - 16.762) -lt 0.001 -and
+        -not $_.result.collisionNormalValid
+    } |
+    Select-Object -First 1
+
+if ($null -eq $overpen)   { throw 'over-penetration tick not found' }
+if ($null -eq $stuckHit)  { throw 'stuck hit=yes tick not found' }
+if ($null -eq $stuckMiss) { throw 'stuck hit=no tick not found' }
+
+@($overpen._raw, $stuckHit._raw, $stuckMiss._raw) | Set-Content -Encoding utf8 -Path $Out
+"Wrote $Out with 3 records (over-penetration + stuck hit + stuck miss)."