The server now writes its startup JSON to $SCREEN_DIR/.server-info.
Agents that launch the server via background execution (where stdout is
hidden) can read this file to get the URL, port, and screen_dir.
Moves lib/brainstorm-server/ → skills/brainstorming/scripts/ so the
brainstorming skill uses relative paths (scripts/start-server.sh) instead
of ${CLAUDE_PLUGIN_ROOT}/lib/brainstorm-server/. This follows the
agentskills.io specification for portable, cross-platform skills.
Updates visual-companion.md references and test paths. All tests pass.