chore: exclude backup and external source directories

Ariver

2026-09-01 2d98902a184d8cd0dff961628505dbdec341b55d

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{
    "schemaVersion": 2,
    "targetPeriod": "2026-09",
    "updatedAt": "2026-08-26T08:35:52.384Z",
    "dates": {}
}