feat: mission autopilot and continuation loops

[Fahremback]

This splits out the mission autopilot logic from #1148 as requested.

Changes addressed from code review:

• Translated hardcoded Portuguese strings (METAS E SUBMETAS, etc.) to English.
• Replaced execSync('git rev-parse...') branch parsing with conversation/scope isolation, keeping files local to the active chat session.
• Fixed the infinite retry loop in use-send-message.ts: it now caps at 5 retries with exponential backoff (up to 15s) instead of polling indefinitely every 3s.
• Dropped the build-binary.ts vendor/billing changes.
• Dropped the terminal command timeout reductions.