docs: record Ob.temp git history slimming

Ariver

2026-09-01 c773fcdd1f73ca6526e11bb672b8fe33e0339a77

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{
    "schemaVersion": 1,
    "updatedAt": "2026-08-26T08:35:52.406Z",
    "dirty": false,
    "affectedMemoIds": [],
    "expectedPeriods": [
        "2026-06",
        "2026-07",
        "2026-08",
        "2026-09"
    ]
}