v0.10.0

Changed — BREAKING

• The GUI's binary-override env var is now $AGENTCTL_BIN (the previous name is no longer
  read). The Swift CLI client type is now AgentctlCLI.
• Default launcher tool renamed to claude. Existing configs that name their own tools are
  unaffected; only the built-in default and the default_tool fallback change.

Removed — BREAKING

• Legacy config migration and fallbacks. The one-time move of the previous config directory,
  and every fallback to the previous environment variable names (config path, home, Claude binary,
  recap model), are gone. Only AGENTCTL_* variables and ~/.config/agentctl are read.