feat: add Utix anomaly detection report for volume, timing, and actor behavior

[viktorlabs]

Overview

This PR adds a read-only anomaly detection report for Utix that flags unusual volume, timing, actor repetition, and failed-operation patterns from fixture data, groups findings by severity and affected resource, and documents how maintainers should triage results while keeping false positives low.

Related Issue

Changes

📊 Anomaly Detection Report

• [ADD] core/analytics/types.ts

  • Defines anomaly signal types for volume, timing, actor repetition, and failed operations.
  • Adds severity levels and affected-resource grouping used by the report output.

• [ADD] core/analytics/index.ts

  • Implements the read-only report builder that evaluates fixture data against the defined signals.
  • Groups findings by severity and affected resource for maintainer triage.

• [ADD] core/analytics/__tests__/aggregator.test.ts

  • Coverage for normal baseline, spike, repeated failure, and suspicious actor scenarios.

• [ADD] docs/ANOMALY_DETECTION.md

  • Documents anomaly signals, report structure, triage guidance, and false-positive mitigation.

• [MODIFY] README.md

  • Points contributors to the anomaly detection docs and validation command.

Verification Results

npm test -- core/analytics/__tests__/aggregator.test.ts
✅ normal baseline, spike, repeated failure, and suspicious actor scenarios covered

Acceptance Criteria	Status
Report identifies anomalous patterns from fixture data	✅ Volume, timing, actor repetition, and failed-operation signals evaluated against fixtures
False-positive mitigation is documented	✅ Documented in docs/ANOMALY_DETECTION.md
Tests cover normal baseline, spike, repeated failure, and suspicious actor scenarios	✅ Covered in core/analytics/__tests__/aggregator.test.ts

Closes #179

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