Done! I've assembled the December 2025 monthly business review deck. 

**Deliverable:** `output/IS_MBR_2025-12.pptx`

The deck includes six slides with all figures traced to the scorecard and MBR files:
- **Slide 1** — Title slide with company name
- **Slide 2** — Headlines summarizing the month's key results  
- **Slide 3** — P&L vs. budget (revenue, gross profit, margin %, opex, operating income)
- **Slide 4** — KPI scorecard (8 metrics with actual, target, status)
- **Slide 5** — Drivers (month's top three line item variances)
- **Slide 6** — Watch list (four KPIs off target, with streak counts)

All 52 figures in the deck are copied exactly from the source files and conform to InterStationary's house format and voice.