v0.2.0

Changelog

• e94b4fa P3: the three-emulator secret-as-SP-credential chain, in CI
• a05ca7a P4 parity: Secure Key Release + certificate CSR merge
• 0e902dc P4: SDK parity surface — key import, backup/restore, rng, cert issuers/contacts
• db7ecd9 Portal: embedded Svelte operator UI at /_emulator/portal/
• 21b4282 ci(chain): GOTOOLCHAIN=auto + surface install errors
• d4d6234 e2e(chain): rewrite the harness as run.py (Python over shell)