Two critical fixes for build retry behavior:
1. pod_git_operations.go: Normalize remote URL before comparison
- Clone stores URL with token (https://token:x@host/...)
- Subsequent retry compares against URL without token
- Without normalization, URLs never match, so workspace is always
cleared and re-cloned, losing all code from previous attempt
2. build_audit.go: Clear stale result data when task transitions to running
- When a failed task is retried, UpdateStatus only updated status/worker_id
- Result and completed_at from previous failure remained, causing
API to return stale failure data even while retry was running
- Now clears result, completed_at and resets started_at when
status is set to "running"
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>