feat(launcher-test): migrate to test-lib (Test-Opt Phase 3.6)

Per ADR-0037 Tests-as-Libs Convention. Renamed on Gitea +
moved locally to lib-sporel/launcher-test. fsm.lua and dofile
pattern preserved; Pre-S15 drift-check still applies.

init.lua

@@ -7,9 +7,11 @@
 -- Sporel-Resolver lehnt module-als-dep ab (nur lib-deps werden resolved),
 -- daher hat dieses Test-Modul seine eigene fsm.lua. Drift wird via Smoke-
 -- diff-check verhindert (siehe smoke.sh P0-S15-pre).
+local M = {}
+
 local fsm = dofile(engine.module.dir_of("lib-sporel.launcher-test") .. "/fsm.lua")
 
-function init(ctx)
+function M.run_tests(ctx)
     -- FSM transitions (5)
     engine.test.equals(fsm.next(fsm.STATE_LIST,         "esc"),         fsm.STATE_QUIT_CONFIRM, "list+esc -> quit_confirm")
     engine.test.equals(fsm.next(fsm.STATE_QUIT_CONFIRM, "esc"),         fsm.STATE_LIST,         "quit_confirm+esc -> list")
@@ -27,3 +29,5 @@ function init(ctx)
     engine.test.assert(type(engine.render.measure_text) == "function", "engine.render.measure_text is function")
     engine.test.assert(type(engine.module.list())       == "table",    "engine.module.list() returns table")
 end
+
+return M