Revert memory commit/push — gitignore life/ and memory/ instead

Agent memory files can contain secrets (API keys, credentials, infra
details). These must not be committed to git. Memory persists on the
pod's persistent volume. Git is for board-authored config only.

- Added life/ and memory/ back to .gitignore
- Removed git add/commit/push from CEO heartbeat sync (pull-only now)
- Removed auto-merge workflow (no longer needed)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitignore

@@ -10,6 +10,10 @@
 .gitconfig
 .kube/
 
+# Agent memory (persists on volume, contains secrets — never commit)
+life/
+memory/
+
 # Editor swap files
 *.swp
 *.swo