Synara v0.3.9

What's Changed

• Preserve archived profile stats after thread purge by @Emanuele-web04 in #292
• fix(acp): prevent assistant message ID collisions across runtime restarts by @kartikkabadi in #298
• feat: /export slash command — thread ZIP download (supersedes #264 with review fixes) by @Emanuele-web04 in #297
• Fix Git writing model picker for OpenCode and Kilo discovery by @kartikkabadi in #301

Full Changelog: v0.3.8...v0.3.9