chore: untrack internal docs and session files from public repo

- Untrack AGENTS.md (AI session context, not public-facing)
- Untrack docs/specs/ and docs/superpowers/ (internal planning docs)
- Add AGENTS.md, docs/superpowers/, docs/specs/, .autoship/ to .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Maleick

.gitignore

@@ -3,6 +3,14 @@
 .wolf/
 .serena/
 CLAUDE.md
+AGENTS.md
+
+# Internal planning/spec docs
+docs/superpowers/
+docs/specs/
+
+# AutoShip runtime state
+.autoship/
 
 # Autoresearch runtime artifacts
 autoresearch-results.tsv