docs(daily-maintenance): add scope and working-hours audit checkpoint (Tier 1)

[dembrane-sam-bot]

• What is this change?: Adds an explicit ### Scope and working-hours audit checkpoint to the start-of-day daily-maintenance routine.
• What did Sam notice that led to this?: During the Claude Opus mentor review of yesterday's massive database mining passes, the mentor flagged that multiple heavy research and bulk-export sessions were triggered by a non-principal operator (Jor) and one large report was posted after-hours (21:55 local), without any automated daily checkpoints checking these constraints. This codifies the checkpoint to ensure Sam remains highly self-aware of non-principal behavior mining and working-hours compliance.
• Tier?: Tier 1 (freely propose prose edits to recipe skills)
• Confidence?: 100% (documentation-only update, all 653 runtime tests passed successfully).