v0.4.1

Added

• docbridge init for CLI-driven first-time setup: repository scope discovery,
  safe docbridge.config.json creation, and DocBridge agent skill installation.
• docbridge init-with-agent for agent-guided adoption: installs
  docbridge-adopt and prints one-shot setup commands without launching an
  agent process.
• docbridge-adopt now installs the companion DocBridge skills after adoption
  scope is confirmed.