Add reacher-z UBC Vector 60-environment Track 2 corpus

[reacher-z]

Track 2 environment entry: reacher-z-ubc-vector

Entry

• Team: reacher-z-ubc-vector
• Contact: reacher@cs.ubc.ca
• Track: environments
• Environments: 60
• Author: Yuxuan Zhang
• Affiliation: University of British Columbia; Vector Institute

The entry contains 12 deterministic workflow families with five distinct modes each: baseline audit, source-priority conflict resolution, as-of filtering, prior-attempt recovery, and adversarial distractor exclusion.

Validation

• python3 scripts/check_task.py submissions/reacher-z-ubc-vector/envs: 60/60 valid
• python3 scripts/check_submission.py: entry valid
• Double host oracle/verifier runs: 120/120 pass, byte-identical per environment
• Empty/nop checks: 60/60 rejected
• Empty-answer mutants: 60/60 rejected
• Official Docker oracle replays: 60/60 score 1.0
• Official Docker empty-trial replays: 60/60 score 0.0
• Prompt-body pairs with Jaccard >= 0.80: 0

Representative run_local.sh oracle tail:

3 passed, 1 warning in 0.02s
reward: 1.0
✓ capacity-schedule-adversarial — oracle scores 1.0

Representative run_local.sh --skip-oracle tail:

3 failed, 2 warnings in 0.16s
reward: 0.0
✓ capacity-schedule-adversarial — empty trial correctly scores 0.0

The environments are offline and use deterministic synthetic fixtures. The managed competition pipeline remains authoritative for leakage, reward-hacking, and difficulty review.

[reacher-z]

Validation update: I retriggered the current base-repository tasks-check workflow at commit 6e690f0; GitHub currently reports the run as action_required, so a maintainer must approve the fork workflow before checks can attach to the PR. The same two self-contained commands pass locally on the exact commit: python3 scripts/check_task.py and python3 scripts/check_submission.py (including reacher-z-ubc-vector — valid). No environment payloads changed in this retrigger commit.