pi-goal

Small Codex-inspired /goal extension for Pi.

This implementation combines:

• Codex/PurpleMyst-style guarded continuation prompts with XML-escaped untrusted objectives.
• zereraz-style runtime features: hidden continuations, get_goal, update_goal, elapsed time, optional token budgets, and budget-limit wrap-up prompts.

• /goal <objective> starts a new active goal.
• /goal <objective> --budget 50k starts a goal with an approximate token budget.
• /goal or /goal status shows the current goal.
• /goal pause, /goal resume, /goal clear.

Pi extensions do not expose Codex's internal token accounting or developer-message queue. This extension therefore:

• Injects a guarded goal summary into before_agent_start.
• Sends continuation prompts as hidden Pi messages with triggerTurn: true.
• Tracks elapsed wall-clock time exactly for active turns.
• Estimates token usage conservatively as a configurable fixed amount per completed active turn.

The objective is always framed as untrusted user data and XML-escaped before being placed in prompt templates.