chore: make release script non-interactive with CI retry logic (#130)

- Remove y/N confirmation prompt for automation
- Add wait_for_ci() with retry logic (polls until checks appear)
- Auto-detect git remote (origin or github)
- Remove unused /etc/nginx/conf.d tmpfs from compose
- Update release-manager agent docs to match

docker-compose.yml

@@ -52,7 +52,6 @@ services:
       - /tmp:noexec,nosuid,size=64m
       - /var/cache/nginx:noexec,nosuid,size=64m
       - /var/run:noexec,nosuid,size=64m
-      - /etc/nginx/conf.d:noexec,nosuid,size=1m
     cap_drop:
       - ALL