rename to lib-management.launcher (was lib-sporel.launcher)

Per ADR-0045 (three-tier library naming) the launcher migrates from
the retired lib-sporel.* prefix to the new lib-management.* tier for
host-infrastructure libs. Updates:

- manifest.module id: lib-sporel.launcher -> lib-management.launcher
- manifest.core id: lib-sporel.launcher.core -> lib-management.launcher.core
- init.lua engine.module.dir_of("lib-management.launcher")
- README + fsm.lua comment refs

Gitea repo renamed in lockstep:
sporel/sporel-module-lib-sporel.launcher ->
sporel/sporel-module-lib-management.launcher

manifest.module

@@ -1,5 +1,5 @@
 {
-  "id": "lib-sporel.launcher",
+  "id": "lib-management.launcher",
   "version": "0.1.0",
   "kind": "module",
   "api": "^0.1",