chore(prototype): add in-game vehicle probe game script

Throwaway probe for "Probe vehicle data and native passing in game":
logs every player-owned road vehicle's MovePath/LandVehicle/move-info
state every 5s and groups vehicles by street segment to expose lanes
and oncoming traffic.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mod/content/overtake_probe.gs.lua

@@ -0,0 +1,8 @@
+-- PROTOTYPE (ticket "Probe vehicle data and native passing in game"): throwaway, lives only on branch prototype/vehicle-probe.
+function data()
+	return {
+		updateScript = {
+			fileName = "overtake_probe.script@update",
+		},
+	}
+end

mod/content/overtake_probe.script.tl

@@ -0,0 +1,70 @@
+-- PROTOTYPE (ticket "Probe vehicle data and native passing in game"): throwaway, lives only on branch prototype/vehicle-probe.
+-- Every INTERVAL it dumps every player-owned road vehicle, then groups them by street segment
+-- so lanes (edge index) and oncoming traffic (opposite direction / turnaround edge) are visible in stdout.txt.
+-- ponytail: module-local timer, not GameScriptState; fine for a probe, resets on reload.
+
+local TAG = "[overtake_probe] "
+local INTERVAL = 5.0
+local elapsed = 0.0
+local ticks = 0
+
+local function p(s : string)
+	print(TAG .. s)
+end
+
+local function edgeAt(mp : Engine.Component.MovePath) : EdgeId, boolean
+	local e = mp.path.edges[mp.dyn.pathPos.edgeIndex + 1]
+	if e == nil then return nil, nil end
+	return e[1], e[2]
+end
+
+local function turnaround(edge : EdgeId) : integer
+	local tn = api.engine.getComponent(edge.entity, api.type.ComponentType.TRANSPORT_NETWORK) as Engine.Component.TransportNetwork
+	if tn == nil or tn.turnaroundEdges == nil then return nil end
+	return tn.turnaroundEdges[edge.index + 1]
+end
+
+local function dump(dt : number)
+	local player = api.engine.util.getPlayer()
+	local vehicles = api.engine.getEntitiesWithComponent(api.type.ComponentType.TRANSPORT_VEHICLE, { requireOwnedByPlayer = player })
+	p(string.format("tick=%d dt=%s playerVehicles=%d", ticks, tostring(dt), #vehicles))
+
+	local bySegment : {integer : {string}} = {}
+	for _, v in ipairs(vehicles) do
+		local lv = api.engine.getComponent(v, api.type.ComponentType.LAND_VEHICLE) as Engine.Component.LandVehicle
+		local mp = api.engine.getComponent(v, api.type.ComponentType.MOVE_PATH) as Engine.Component.MovePath
+		if lv ~= nil and not lv.isTram and mp ~= nil then
+			local edge, dir = edgeAt(mp)
+			local info = api.engine.system.landVehicleMoveSystem.getVehicleInfo(v)
+			local seg = edge and edge.entity or -1
+			local line = string.format(
+				"veh=%d seg=%d lane=%s dir=%s turnaround=%s pos=%.1f speed=%.2f accel=%.2f blocked=%s state=%s standing=%.1f timeToIgnore=%.2f timeUntilAccel=%.2f occ=%s..%s brake=%.1f power=%s traction=%s",
+				v, seg, tostring(edge and edge.index), tostring(dir), tostring(edge and turnaround(edge)),
+				mp.dyn.pathPos.pos, mp.dyn.speed, mp.dyn.accel, tostring(mp.blocked), tostring(mp.state),
+				mp.dyn.timeStanding, mp.dyn.timeToIgnore, mp.dyn.timeUntilAccel,
+				tostring(mp.occupiedBackIndex), tostring(mp.occupiedFrontIndex), lv.dyn.brakingTimer,
+				tostring(info and info.availPower), tostring(info and info.traction))
+			p(line)
+			bySegment[seg] = bySegment[seg] or {}
+			table.insert(bySegment[seg], string.format("%d(lane=%s,dir=%s,v=%.1f,blk=%s)", v, tostring(edge and edge.index), tostring(dir), mp.dyn.speed, tostring(mp.blocked)))
+		end
+	end
+	for seg, list in pairs(bySegment) do
+		if #list > 1 then
+			p(string.format("SHARED seg=%d: %s", seg, table.concat(list, " ")))
+		end
+	end
+end
+
+local ret : GameScript<table> = {
+	update = function(_userParams : table, _state : GameScriptState<table>, dt : number) : nil
+		ticks = ticks + 1
+		elapsed = elapsed + dt
+		if ticks == 1 then p("update running, first dt=" .. tostring(dt)) end
+		if elapsed < INTERVAL then return end
+		elapsed = 0.0
+		xpcall(dump, function(err : any) p("ERROR " .. tostring(err)) end, dt)
+	end,
+}
+
+return ret