v2026.3.8

Changes

• Add persistent markdown memory with hybrid SQLite recall and agent flush integration
• Add x_search tool and x-research skill for public sentiment research
• Add group chat support for WhatsApp gateway (mention-based activation, group context)
• Add gpt-5.4 model support
• Update location of hidden files to project root
• Turn off LangSmith tracing by default

Fixes

• Fix gateway to use model and provider from user settings (.dexter/settings.json) instead of hardcoded gpt-5.4/openai