clean: remove .pi/ config from calvana repo — lives in pi-vs-claude-code now

- Removed all .pi/ (agents, themes, extensions, skills, observatory)
- Removed CLAUDE.md (belongs in parent pi repo)
- Added .pi/ and CLAUDE.md to .gitignore
- Added .pi/ to pledge-now-pay-later/.gitignore

.gitignore

@@ -1,7 +1,8 @@
 node_modules/
-.pi/agent-sessions/
+.pi/
 calvana.tar.gz
 *.tmp
 nul
 .env
 .playwright-cli/
+CLAUDE.md