feat: add honcho-memory skill

[LubaKaper]

Adds a new community skill that gives AI agents persistent memory across conversations
using https://honcho.dev.

What it does

Three ready-to-use tools:

• save_memory — saves user/assistant messages to Honcho
• query_memory — asks natural language questions about what the AI remembers ("What
  are my hobbies?")
• get_context — retrieves conversation history formatted for direct LLM use

Notes

• Tested live in Zo Computer
• Already merged into the official https://github.com/plastic-labs/honcho repo as part
  of their examples
• Requires a free Honcho API key from https://honcho.dev

[LubaKaper]

Hey @erhuve ! Just added a DISPLAY.json with icon, tags, and integration metadata.
Let me know if there's anything else needed to get this merged!