v1.5.3 - Claude conversation import fix

Fixed

• Claude.ai conversation export import. from_conversations() only recognized
  {messages: [...]} / {mapping: {...}} with plain-string content. Claude.ai's
  real "Export Data" output uses chat_messages, sender (not role), name
  (not title), and content as a list of Anthropic-style blocks rather than a
  string. Every Claude conversation export was silently importing 0 memories.
  Verified against a real 93-conversation export.

Added

• Remote MCP transport (ele serve --transport http) for clients that need
  Streamable HTTP instead of stdio — e.g. ChatGPT's Developer Mode connector.
  Verified live against a real ChatGPT connection through a tunnel.

See CHANGELOG.md for full details.