Agent prompt files (both workspace agents/<name>.md and embedded)
now support template variables like {{today}}.
This allows agent definitions to include dynamic content:
# My Agent
Today is {{today}}. Your mission is...
• Agent prompts are now embedded within the g3 binary
• README.md - Added new "Agent Mode" section documenting:
• All 7 built-in agents with their focus areas
• Usage examples (--list-agents, --agent <name>)
• How to create custom workspace agents
Behavior
1. Workspace agents take priority - If agents/<name>.md exists in the workspace, it's used
2. Embedded fallback - If no workspace agent exists, the embedded version is used
3. Portability - g3 binary now works on any repo without needing the agents/ directory
4. Discoverability - g3 --list-agents shows all available agents and their source
