feat: add CI-hooks for render-hook + state-transition smoke

Two env-var-gated hooks (no-op in normal play):
- SPOREL_CI=1: emits 'vagrant: render_frame_ok' per frame from
  render() and 'vagrant: frame_avg_ms=N' after 60 frames.
- SPOREL_VAGRANT_PHASE1_DRIVE=1: scripted move-right input on
  frames 21-40, idle otherwise. Combined with SPOREL_CI=1 produces
  observable idle -> walk -> idle state cycle.

State-transition trace 'vagrant: state=<walk|idle>' emits exactly
once per actual change in set_walk_or_idle, so the smoke greps
don't get noise from per-frame repeats.

Fix camera.set_target_provider (absent from camera API) to use
camera.set_target(x, y) called per frame from M.update instead.

init.lua

@@ -19,8 +19,12 @@ local state = {
 local CI_FRAME_PERF = (os.getenv("SPOREL_CI") == "1")
 local ci_frame_count = 0
 local ci_t_start     = nil
+local CI_DRIVE = (os.getenv("SPOREL_VAGRANT_PHASE1_DRIVE") == "1")
+local ci_drive_frame = 0
+local ci_last_state = nil
 
 local function set_walk_or_idle(moving)
+    local new_state = moving and "walk" or "idle"
     if moving then
         if not puppet.is_playing(state.player, "walk") then
             puppet.stop(state.player, "idle")
@@ -32,6 +36,10 @@ local function set_walk_or_idle(moving)
             puppet.play(state.player, "idle", { loop = true })
         end
     end
+    if CI_FRAME_PERF and new_state ~= ci_last_state then
+        engine.print("vagrant: state=" .. new_state)
+        ci_last_state = new_state
+    end
 end
 
 function M.init(ctx)
@@ -55,10 +63,9 @@ function M.init(ctx)
     input.bind("walk_down",  { "s" })
     input.bind("quit_to_launcher", { "escape" })
 
-    -- Camera follows player position (no manual pan in vagrant-style)
-    camera.set_target_provider(function()
-        return puppet.position(state.player)
-    end)
+    -- Camera follows player on first frame
+    local init_pos = puppet.position(state.player)
+    camera.set_target(init_pos.x, init_pos.y)
 
     if CI_FRAME_PERF then
         ci_t_start = engine.time.now()
@@ -85,6 +92,21 @@ function M.update(ctx, dt)
             pos.x + dx / len * state.player_speed * dt,
             pos.y + dy / len * state.player_speed * dt)
     end
+
+    if CI_DRIVE then
+        ci_drive_frame = ci_drive_frame + 1
+        -- Frames 1-20: idle (no move), 21-40: move-right, 41-60: idle again
+        if ci_drive_frame > 20 and ci_drive_frame <= 40 then
+            dx = 1; dy = 0
+            moving = true
+            local pos = puppet.position(state.player)
+            puppet.move_to(state.player,
+                pos.x + dx * state.player_speed * dt, pos.y)
+        else
+            moving = false
+        end
+    end
+
     set_walk_or_idle(moving)
 
     -- Headtrack: head looks at mouse world-position
@@ -92,6 +114,10 @@ function M.update(ctx, dt)
     local wx, wy = camera.screen_to_world(mx, my)
     puppet.set_look_target(state.player, wx, wy)
 
+    -- Camera follows player position each frame (vagrant-style no-pan)
+    local cam_pos = puppet.position(state.player)
+    camera.set_target(cam_pos.x, cam_pos.y)
+
     camera.update(dt)
     puppet.update(dt)