chore: v2.0.0-alpha.9 — engines Claude/Codex opcionais no preflight (#18)

Bump de release para publicar o #17: o gate "Prerequisite: Claude Code" virou
checagem informativa (nunca bloqueia, nunca pergunta) e o resumo final ganhou
o painel "Engines — who runs your agents" com os comandos exatos do que faltar.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: elberrd

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "impactus",
-  "version": "2.0.0-alpha.8",
+  "version": "2.0.0-alpha.9",
   "description": "IMPACTUS CLI — the IAI installer: agent harness + FIA (the IAI Agent Factory) with Pi, deterministic FDAs and Claude/Codex subscription auth.",
   "type": "module",
   "bin": {