chore(main): release 0.71.0

[github-actions]

🤖 I have created a release beep boop

0.71.0 (2026-08-21)

🚀 Features

• ci: Add snapshot-based teardown lifecycle (#649) (ae74532)
• stacks: Add PostgREST — auto-generated REST API for shared Postgres (#645) (a9cb829)

🐛 Bug Fixes

• ci: Stop overriding admin_username default in workflows (#639) (4221651)
• orchestrator: Drop subprocess stdout from woodpecker-apply phase result (#640) (7a57ef7)
• redpanda: Remove Admin API (9644) from firewall-exposable tcp_ports (#642) (323fcee)
• redpanda: Use rpk --password-stdin to keep SASL password off argv (#643) (6e20c48)
• tofu: Validate firewall_rules source_ips instead of silently allowing all (#638) (59ed0a4)

⚡ Performance

• ci: Cache OpenTofu providers + Control-Plane node_modules in spin-up (#644) (396ff70)

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