diff --git a/client/scripts/main.gd b/client/scripts/main.gd
index 57bc70b..bfe9e7a 100644
--- a/client/scripts/main.gd
+++ b/client/scripts/main.gd
@@ -67,3 +67,28 @@ func _on_move_rejected(reason_code: String) -> void:
 				_move_reject_label.text = "",
 		CONNECT_ONE_SHOT
 	)
+
+
+## Dev smoke (NEON-28 occluder purge): **F9** frees `Obstacle` while testing; remove when no longer needed.
+## After removing nav source geometry, we **rebake** — otherwise `NavigationAgent3D` keeps a stale map
+## and click-to-move can stop working.
+func _unhandled_key_input(event: InputEvent) -> void:
+	if not event is InputEventKey:
+		return
+	var k := event as InputEventKey
+	if k.pressed and not k.echo and k.keycode == KEY_F9:
+		var obstacle := get_node_or_null("World/NavigationRegion3D/Obstacle")
+		if obstacle:
+			obstacle.queue_free()
+			call_deferred("_rebake_nav_mesh_after_obstacle_removed")
+
+
+func _rebake_nav_mesh_after_obstacle_removed() -> void:
+	_nav_region.bake_navigation_mesh(false)
+	await get_tree().physics_frame
+	await get_tree().physics_frame
+	if not is_instance_valid(_player):
+		return
+	var na := _player.get_node_or_null("NavigationAgent3D") as NavigationAgent3D
+	if na != null:
+		na.set_target_position(_player.global_position)
diff --git a/docs/plans/NEON-28-implementation-plan.md b/docs/plans/NEON-28-implementation-plan.md
index 51e9ea6..7f34acf 100644
--- a/docs/plans/NEON-28-implementation-plan.md
+++ b/docs/plans/NEON-28-implementation-plan.md
@@ -106,7 +106,7 @@ Jira acceptance criteria (verbatim intent):
 
 **Manual verification:** Main scene — zoom bands, occlusion fade, fixed yaw UX; spot-check Slice 2 behaviors (readable motion, occlusion active).
 
-**Freed occluder (end-to-end, editor):** Position player so `Obstacle` is between camera and player (fade active), then `queue_free` the occluder (remote inspector or one-shot script). Expect **no** recurring script errors and **no** stuck transparent materials on other meshes. **Smoke-tested on the story branch in-editor (2026-04-10)** before merge handoff — complements static `occluder_override_key_is_valid` tests, which do not execute the full purge path in CI.
+**Freed occluder (end-to-end, editor):** Position player so `Obstacle` is between camera and player (fade active), then `queue_free` the occluder. Expect **no** recurring script errors and **no** stuck transparent materials on other meshes. **`Obstacle` lives under `NavigationRegion3D`** — after removing it, **rebake** the nav mesh (see **`main.gd` F9** dev path: `bake_navigation_mesh(false)` + refresh `NavigationAgent3D` target) or click-to-move can stop until the next full scene reload. Complements static `occluder_override_key_is_valid` tests, which do not execute the full purge path in CI.
 
 ## Open questions / risks