Wire up editor: input bindings, frame hooks, launcher script

init.lua loads the work map, binds hotkeys (E/R/S/Esc), tracks
mouse-cell per frame, dispatches clicks to the UI hit-tester
and falls through to paint-cell for unconsumed map-area clicks.
run-map-editor.sh handles copy-in/copy-out for a real target map
or runs in-place against the module's work slot.

init.lua

@@ -1,18 +1,91 @@
 -- sporel-module-map-editor v0.1.0
--- Interactive map editor; full wiring lands in subsequent commits.
+-- Interactive map editor — see docs/superpowers/specs/2026-05-23-sporel-module-map-editor-design.md
 
-local maps = require("lib-core.maps")
+local maps    = require("lib-core.maps")
+local camera  = require("lib-core.camera")
+local input   = require("lib-core.input")
+local state   = require("src.state")
+local actions = require("src.actions")
+local ui      = require("src.ui")
 
-local work_map_id = maps.load("maps/work.map.json")
+-- =====================================================================
+-- Setup
+-- =====================================================================
+local WORK_PATH = "maps/work.map.json"
+local work_map_id = maps.load(WORK_PATH)
 maps.set_current(work_map_id)
 maps.load_textures(engine.module.asset_aliases())
+state.set_map(work_map_id, WORK_PATH)
 
-engine.print("map-editor: scaffold loaded, map_id=" .. work_map_id)
+-- Center camera on the map
+local m_size = maps.size()
+local t_size = maps.tile_size()
+camera.set_target((m_size.w * t_size) / 2, (m_size.h * t_size) / 2)
+camera.set_zoom(1.0)
 
+-- =====================================================================
+-- Input bindings
+-- =====================================================================
+input.bind("quit",      { "escape" })
+input.bind("erase",     { "e" })
+input.bind("rotate",    { "r" })
+input.bind("save_map",  { "s" })
+
+engine.print("map-editor: ready. Hotkeys: E=erase, R=rotate, S=save, ESC=quit")
+
+-- =====================================================================
+-- Frame hooks
+-- =====================================================================
 function update(ctx, dt)
-    -- TODO: wired in later commits
+    -- Quit
+    if input.was_action_pressed("quit") then
+        engine.exit()
+        return
+    end
+
+    -- Update mouse-cell tracking for status chip
+    local mx, my = engine.input.get_mouse_pos()
+    local wx, wy = camera.screen_to_world(mx, my)
+    local cell_x = math.floor(wx / t_size)
+    local cell_y = math.floor(wy / t_size)
+    if cell_x >= 0 and cell_y >= 0 and cell_x < m_size.w and cell_y < m_size.h then
+        state.set_mouse_cell(cell_x, cell_y)
+    else
+        state.set_mouse_cell(nil)
+    end
+
+    -- Hotkey: rotate
+    if input.was_action_pressed("rotate") then
+        actions.cycle_rotation()
+    end
+
+    -- Hotkey: save
+    if input.was_action_pressed("save_map") then
+        actions.save()
+    end
+
+    -- Hotkey: erase (uses current mouse-hover cell)
+    if input.was_action_pressed("erase") then
+        local cell = state.get_mouse_cell()
+        if cell then actions.erase_cell_at(cell.x, cell.y) end
+    end
+
+    -- Mouse clicks: hit-test UI first, then map area
+    if engine.input.was_mouse_pressed(engine.input.MOUSE_LEFT) then
+        local consumed = ui.handle_click(mx, my, "left")
+        if not consumed and state.get_mouse_cell() then
+            local cell = state.get_mouse_cell()
+            actions.paint_cell_at(cell.x, cell.y)
+        end
+    end
+    if engine.input.was_mouse_pressed(engine.input.MOUSE_RIGHT) then
+        ui.handle_click(mx, my, "right")
+    end
+
+    camera.update(dt)
 end
 
 function draw()
     maps.draw_map()
+    ui.draw()
 end