Add per-agent workspaces and MCP/skills backlog doc

- Add agent_workspaces/{ilia,family,wife} skeletons (AGENTS, USER, SOUL, memory)
- Add scripts/init-agent-workspaces.sh to populate ~/.nanobot/workspaces/
- Mount ~/.nanobot/workspaces/{ilia,family,wife} in multi compose as /workspace
- Document Step 0 and layout in DOCKER_MULTI_BOT_GUIDE.md
- Track docs/mcp_and_skills_backlog.md (force-add; docs/ is gitignored)

Made-with: Cursor

agent_workspaces/family/memory/HISTORY.md

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+# Event log — Family
+
+Append-only style log for this household agent.

agent_workspaces/family/memory/MEMORY.md

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+# Long-term memory — Family
+
+Household-level facts (recurring events, preferences, school names). **Do not store secrets** (passwords, full IDs).
+
+_Empty placeholder — add bullet facts here over time._