chore: bump v2.0.0-alpha.20 (#46)

Fecha a release com /llm + imp llm (#42), guards do /qa (#43) e o novo
/defer + imp defer (#45) — pronta para npm publish.


Claude-Session: https://claude.ai/code/session_01B9gdPsvMDQNkqKpz9HPx4X

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.19",
+  "version": "2.0.0-alpha.20",
   "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": {