Agent workflow upgrades

Droid gets a native Agent Instructions viewer, a configurable footer terminal, and fixes for parent-agent subagent output capture.

This is the release where the app starts showing more of the invisible context agents are actually using.

• Added native agent instruction viewing for project/global agent files
• Added configurable footer terminal support
• Fixed subagent terminal output capture
• Simplified the unsigned release workflow
• Fixed release workflow Xcode setup