chore(prototype): try re-path via makeVehicleSetLineCmd; record failed rebuild

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

mod/content/overtake_probe.script.tl

@@ -8,7 +8,8 @@
 local TAG = "[overtake_probe] "
 local INTERVAL = 2.0
 local MAX_GAP = 40.0
-local MAX_REBUILDS = 3 -- per save; counted in GameScriptState because module locals don't persist
+local MAX_REBUILDS = 0 -- rebuild disabled: proposals were silently rejected (segments kept their ids)
+local MAX_SETLINES = 5 -- EXPERIMENT: re-assign the follower to its own line + current stop to force a re-path
 local elapsed = 0.0
 local ticks = 0
 
@@ -38,6 +39,7 @@ end
 
 local record ProbeState
 	rebuilds : integer
+	setlines : integer
 	watch : {integer} -- vehicles involved in the last rebuild, flagged in later dumps
 end
 
@@ -78,16 +80,34 @@ local function rebuild(seg : integer)
 	api.cmd.sendCommand(api.cmd.makeWorldBuildProposalCmd(proposal, nil, true, false))
 end
 
+-- lanes of the next few path edges, to see whether a re-path changes the lane choice
+local function lanesAhead(mp : Engine.Component.MovePath) : string
+	local out : {string} = {}
+	local edges = mp.path.edges as {any}
+	for k = mp.dyn.pathPos.edgeIndex + 1, math.min(#edges, mp.dyn.pathPos.edgeIndex + 4) do
+		local e = edges[k] as UtilPathfinding.EdgeIdDir
+		table.insert(out, e.edgeId.entity .. ":" .. e.edgeId.index)
+	end
+	return table.concat(out, " ")
+end
+
+local function setLine(v : integer)
+	local tv = api.engine.getComponent(v, api.type.ComponentType.TRANSPORT_VEHICLE) as Engine.Component.TransportVehicle
+	p(string.format("SETLINE_TEST send veh=%d line=%s stopIndex=%s", v, tostring(tv.line), tostring(tv.stopIndex)))
+	api.cmd.sendCommand(api.cmd.makeVehicleSetLineCmd(v, tv.line, tv.stopIndex))
+end
+
 local function dump(dt : number, state : GameScriptState<ProbeState>)
 	local st = state:get()
 	st.rebuilds = st.rebuilds or 0
+	st.setlines = st.setlines or 0
 	st.watch = st.watch or {}
 	local watched : {integer : boolean} = {}
 	for _, w in ipairs(st.watch) do watched[w] = true end
 
 	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 rebuilds=%d", ticks, tostring(dt), #vehicles, st.rebuilds))
+	p(string.format("tick=%d dt=%s playerVehicles=%d rebuilds=%d setlines=%d", ticks, tostring(dt), #vehicles, st.rebuilds, st.setlines))
 
 	local byLane : {string : {Car}} = {}
 	local laneSeg : {string : integer} = {}
@@ -103,6 +123,7 @@ local function dump(dt : number, state : GameScriptState<ProbeState>)
 				watched[v] and "WATCH " or "", v, seg, tostring(edge and edge.index), tostring(dir), tostring(edge and turnaround(edge)),
 				mp.dyn.pathPos.edgeIndex, #(mp.path.edges as {any}), mp.dyn.pathPos.pos, mp.dyn.speed, tostring(mp.state),
 				tostring(tv and tv.state), tostring(tv and tv.line), mp.dyn.timeStanding))
+			if watched[v] then p("WATCH   lanesAhead veh=" .. v .. " " .. lanesAhead(mp)) end
 			if edge ~= nil then
 				local key = seg .. ":" .. edge.index
 				byLane[key] = byLane[key] or {}
@@ -112,7 +133,7 @@ local function dump(dt : number, state : GameScriptState<ProbeState>)
 		end
 	end
 
-	if st.rebuilds >= MAX_REBUILDS then return end
+	if st.rebuilds >= MAX_REBUILDS and st.setlines >= MAX_SETLINES then return end
 	for key, cars in pairs(byLane) do
 		for i = 1, #cars do
 			for j = 1, #cars do
@@ -122,6 +143,17 @@ local function dump(dt : number, state : GameScriptState<ProbeState>)
 				-- leader must be moving, otherwise it's a queue at a stop or junction, not a slow vehicle
 				if i ~= j and ahead and math.abs(b.pos - a.pos) < MAX_GAP and b.speed > 1.0 then
 					local seg = laneSeg[key]
+					if st.setlines < MAX_SETLINES then
+						local amp = api.engine.getComponent(a.v, api.type.ComponentType.MOVE_PATH) as Engine.Component.MovePath
+						p(string.format("SETLINE_TEST candidate seg=%d follower=%d (v=%.2f) leader=%d (v=%.2f) lanesAhead before: %s",
+							seg, a.v, a.speed, b.v, b.speed, lanesAhead(amp)))
+						setLine(a.v)
+						st.setlines = st.setlines + 1
+						st.watch = { a.v, b.v }
+						state:set(st)
+						return -- one experiment per dump
+					end
+					if st.rebuilds >= MAX_REBUILDS then return end
 					local ok, why = rebuildable(seg)
 					p(string.format("REBUILD_TEST candidate seg=%d follower=%d (pos=%.1f v=%.2f) leader=%d (pos=%.1f v=%.2f) ok=%s %s",
 						seg, a.v, a.pos, a.speed, b.v, b.pos, b.speed, tostring(ok), why))