feat: add task_24_access_log_anomaly-physical access control log anomaly detection

[905timur]

New Task: Access Control Log Anomaly Detection

Domain specific analysis task drawn from real physical security operations.
The agent is given a CSV access control event log covering two physically
separate facilities and must identify three classes of security anomaly:
impossible travel (same badge at two buildings within 15 minutes), after-hours
access to restricted server rooms, and repeated denial bursts exceeding a
rolling 10 minute threshold.

The fixture includes deliberate near misses to test rule precision. Badge 6601
has exactly 3 denials (below the threshold of 4) and badge 4105 makes a
legitimate after hours visit to a non restricted door. Models that flag these
are penalised.

Grading is fully automated with no LLM judge dependency.

Baseline Results (5 runs each)

Model	Score
anthropic/claude-opus-4-6	100%
anthropic/claude-sonnet-4-6	80%
openrouter/minimax/minimax-m2.5	80%
openrouter/minimax/minimax-m2.7	36%

The score spread confirms the task discriminates well across capability tiers
without being trivially easy or impossible. The 36% floor on M2.7 reflects
failure on the threshold edge case and rolling window logic rather than
complete task misunderstanding.

Files

• tasks/task_24_access_log_anomaly.md task spec with inline fixture