executor: fix sandbox git fetch + inject prior failure history

Fix: use file:// prefix in git fetch during sandbox teardown to force
pack-protocol transfer. The local optimization uses hard links which
fail across devices and with mixed-owner object stores.

Feature: before running a task, query prior failed/timed-out executions
and prepend their error messages to the agent's --append-system-prompt.
This tells the agent what went wrong in previous attempts so it doesn't
repeat the same mistakes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions