feat: load-memory MCP prompt for Claude Desktop cross-session memory

[helinakdogan]

Summary

• sdk/magnet/mcp_server.py: Added list_prompts and get_prompt handlers
  • Exposes a load-memory prompt in Claude Desktop's prompt picker
  • On selection, fetches the user's behavioral profile via inject_memory server-side
  • Returns memory context as a conversation message Claude uses immediately
  • Falls back gracefully if no profile exists yet
  • Accepts optional user_id and project_id arguments (defaults to MAGNET_USER_ID env var)
• sdk/pyproject.toml: Bumped version to 0.1.1

Usage in Claude Desktop

1. Start a new conversation
2. Click the prompt picker (✦ icon) → select load-memory
3. Claude receives your memory profile as context automatically

Test plan

• load-memory prompt appears in Claude Desktop prompt picker after reconnect
• Selecting it with no prior profile returns "No memory profile found" message
• After add_signal stores a preference, selecting prompt returns that preference in injection
• user_id / project_id arguments override env var defaults

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