Done. I've built the 13-week cash forecast and written the cash memo.

**Key points:**
- **Covenant breach in week 5**: Cash closes at $736K, which is $14K below the $750K minimum.
- **Trough**: Week 5 is the lowest point; recovery occurs in week 6 when cash rebounds to $816K.
- **Horizon**: The forecast closes week 13 at $800K with $50K of headroom above the minimum.

**Output files:**
- `output/cash13.json` — computed figures and verification
- `output/cash13-note.md` — cash memo with the weekly forecast table, covenant flag, and four operational levers the treasurer can consider to avoid the breach (accelerate collections, defer vendor payments, arrange a credit line, or flex capex timing).