DD Handoff – health-data skill

- **Scope:** Parses Apple Health exports (export.zip or apple_health_export/export.xml) locally. No network calls; the script only heads into temporary files to read XML via `xmlstarlet`. - **Data sensitivity:** The XML contains PII/PHI (biometric, sleep, heart-rate, location/activity); treat it like medical data. Remove the export (and any derivative JSON) after the analysis, and do not paste raw values into chat or public systems without explicit consent/justification. - **Temporary storage:**