fix(P.3.4): self-contained fsm.lua, drop module-dep (resolver only handles libs)

Sporel resolver does NOT resolve module-as-dep (only lib-deps). Test-module
ships its own byte-identical copy of fsm.lua and loads it via dir_of(self).
Drift prevention deferred to Smoke diff-check (next slice).

Also dropped runtime-behavior measure_text assertion (needs Raylib font, not
loaded in headless test-mode). Existence-check (assertion 10) is sufficient.

11 assertions: 5 FSM transitions + 1 FSM stability + 5 Engine-Surface existence.

fsm.lua

@@ -0,0 +1,25 @@
+-- Sporel Launcher — pure-Lua finite state machine.
+-- No engine.* calls; testable directly by lib-sporel.launcher-test.
+
+local M = {}
+
+M.STATE_LIST         = "list"
+M.STATE_QUIT_CONFIRM = "quit_confirm"
+M.EXIT               = "exit"  -- sentinel: caller should engine.exit(0)
+
+-- Events: "esc", "enter", "click_yes", "click_no", "click_module"
+function M.next(state, event)
+    if state == M.STATE_LIST then
+        if event == "esc" then return M.STATE_QUIT_CONFIRM end
+        return M.STATE_LIST
+    elseif state == M.STATE_QUIT_CONFIRM then
+        if event == "esc"       then return M.STATE_LIST end
+        if event == "enter"     then return M.EXIT end
+        if event == "click_yes" then return M.EXIT end
+        if event == "click_no"  then return M.STATE_LIST end
+        return M.STATE_QUIT_CONFIRM
+    end
+    return state
+end
+
+return M