Introduces `scripts/agent/telemetry-aggregate.mjs` to parse, sanitize, and aggregate error logs from the `artifacts/` directory.
- Scans logs for errors and stack traces.
- Sanitizes PII (IPs, emails, keys) using regex.
- Groups errors by stack trace fingerprint (SHA256).
- Outputs a JSON summary (`artifacts/error-aggregates.json`) and a Markdown report (`ai/reports/telemetry-YYYYMMDD.md`).
- Suggests owners based on stack trace paths.
