Hooks save empty input/output with OpenCode integration

[RSystem95]

Description:
After installing cavemem install --ide opencode, hooks fire correctly but save empty input/output fields.
Steps to reproduce:

1. Run cavemem install --ide opencode
2. Use OpenCode to execute commands (glob, read, etc.)
3. Run cavemem search "query" → returns empty input/output
   Expected: Hooks should capture tool input/output
   Actual: input= and output= fields are empty
   Environment:

• cavemem 0.1.3
• OpenCode (latest)
• Ubuntu/Linux
  Notes:
• cavemem doctor shows all IDEs installed correctly
• Worker runs on port 37777
• DB has observations but content is empty
• Manually piping JSON to hooks also saves empty