Aura LLM Gateway v0.15.0

What's Changed

• feat: end-user extended fields (#175 A2b) by @MarcusElwin in #196
• feat: harness payload capture (#175 B6) by @MarcusElwin in #197
• chore: release v0.15.0 by @MarcusElwin in #198

Full Changelog: v0.14.2...v0.15.0