End-of-track report following the same format as
TRACK_COMPLETION_tier2_autonomous_sandbox_20260616.md. Documents:
- 24-commit inventory (10 atomic renames + 14 plan/script commits)
- All 6 phases completed, all 9 verification flags = true
- Pre-existing failures (7 tests, all credentials.toml, confirmed
against origin/master baseline where they also fail)
- 2 surgical doc fixes in error_handling.md (deprecation section +
line 204 contradiction)
- Sandbox enforcement contracts held (4 of 4 hard bans + 4 of 4
secondary contracts)
- User handoff instructions (fetch + diff + merge + per-commit review)
The track is the first end-to-end test of the tier2_autonomous_sandbox;
this report is the final deliverable for that test.
