Engram v1.10.6 — OpenCode Prompt Capture Fix

Fixes the OpenCode plugin's prompt capture mechanism which stopped working after an SDK change.

Bug Fix

• Replaced dead prompt event — the OpenCode plugin now uses the chat.message hook to capture user prompts, replacing the previous prompt event handler that was silently failing after an OpenCode SDK update
• User prompts are now correctly saved to Engram's user_prompts table again