diff --git a/init.lua b/init.lua
index 13aabda..068c0c3 100644
--- a/init.lua
+++ b/init.lua
@@ -1,12 +1,13 @@
-local maps    = require("lib-core.maps")
-local r_lib   = require("lib-core.render")
-local camera  = require("lib-core.camera")
-local input   = require("lib-core.input")
-local player  = require("lib-core.player_control")
+local maps        = require("lib-core.maps")
+local r_lib       = require("lib-core.render")
+local camera      = require("lib-core.camera")
+local input       = require("lib-core.input")
+local player      = require("lib-core.player_control")
+local interaction = require("lib-core.interaction")
 
--- inline stubs (extract in P.0.lib.{actor,interaction})
-local actor        = { hello = function() return "actor stub" end }
-local interaction  = { hello = function() return "interaction stub" end }
+-- inline stub (extract in P.0.lib.actor — currently DEFERRED per
+-- meta/docs/superpowers/specs/2026-05-10-p0-actor-deferral.md)
+local actor = { hello = function() return "actor stub" end }
 
 local demo_map = maps.load("maps/demo.map.json")
 maps.set_current(demo_map)
@@ -19,12 +20,13 @@ local map_center_y = (m_size.h * t_size) / 2
 camera.set_target(map_center_x, map_center_y)
 camera.set_zoom(1.0)
 
--- Bind input actions: ESC quits; WASD/arrows drive player movement
+-- Bind input actions
 input.bind("quit",       { engine.input.KEY_ESCAPE })
 input.bind("move_left",  { engine.input.KEY_A, engine.input.KEY_LEFT })
 input.bind("move_right", { engine.input.KEY_D, engine.input.KEY_RIGHT })
 input.bind("move_up",    { engine.input.KEY_W, engine.input.KEY_UP })
 input.bind("move_down",  { engine.input.KEY_S, engine.input.KEY_DOWN })
+input.bind("interact",   { engine.input.KEY_E })
 
 -- Configure player: defaults are 24x24 + 200 px/sec; place at map-center
 local p_size = player.size()
@@ -33,12 +35,17 @@ player.bind_movement("move_left", "move_right", "move_up", "move_down")
 
 local PLAYER_R, PLAYER_G, PLAYER_B = 200, 60, 80
 
+-- Sign as module-local (actor deferred — see actor-deferral spec)
+-- Tile (4,4) center: 4*32+16 = 144 px in walkable grass-area
+local sign = { x = 144, y = 144, text = "Hier steht: Willkommen im Spine." }
+local SIGN_R, SIGN_G, SIGN_B = 220, 200, 60
+
 local frames = 0
 local TARGET_FRAMES = 60
 
 function init(ctx)
     engine.print("spine-prototype init: maps loaded")
-    engine.print("inline stubs loaded: " .. actor.hello() .. ", " .. interaction.hello())
+    engine.print("inline stubs loaded: " .. actor.hello())
     engine.print(string.format("map size: %dx%d", m_size.w, m_size.h))
     local corner = maps.tile_at(0, 0)
     local interior = maps.tile_at(5, 5)
@@ -54,13 +61,22 @@ function init(ctx)
     local s = player.size()
     engine.print(string.format("player: pos=(%d,%d) size=%dx%d speed=%d",
         p.x, p.y, s.w, s.h, player.speed()))
+
+    interaction.register(sign.x, sign.y, 40, "interact", function(info)
+        engine.print(sign.text)
+    end)
+    engine.print(string.format("interaction: %d trigger(s) registered",
+        interaction.trigger_count()))
 end
 
 function render(ctx)
     engine.render.clear_color(engine.render.rgb(20, 20, 30))
     camera.begin()
     r_lib.draw_map()
-    -- draw player on top of map
+    -- draw sign on top of map
+    engine.render.draw_rect(sign.x - 6, sign.y - 6, 12, 12,
+        engine.render.rgb(SIGN_R, SIGN_G, SIGN_B))
+    -- draw player on top of sign
     local p = player.position()
     local s = player.size()
     engine.render.draw_rect(p.x, p.y, s.w, s.h,
@@ -80,6 +96,9 @@ function update(ctx, dt)
     local s = player.size()
     camera.set_target(p.x + s.w / 2, p.y + s.h / 2)
 
+    -- Interaction proximity-check + dispatch
+    interaction.update(p.x + s.w / 2, p.y + s.h / 2)
+
     frames = frames + 1
     if frames >= TARGET_FRAMES then
         engine.exit(0)
diff --git a/manifest.module b/manifest.module
index f9829bc..0bd0f76 100644
--- a/manifest.module
+++ b/manifest.module
@@ -9,6 +9,7 @@
         {"id":"lib-core.render","version":"0.1.0"},
         {"id":"lib-core.camera","version":"0.1.0"},
         {"id":"lib-core.input","version":"0.1.0"},
-        {"id":"lib-core.player_control","version":"0.1.0"}
+        {"id":"lib-core.player_control","version":"0.1.0"},
+        {"id":"lib-core.interaction","version":"0.1.0"}
     ]
 }