docs(expenses): add Tricount accommodation ledger

README.md

@@ -5,6 +5,7 @@ Group trip: SF → Yosemite → Sequoia → LA → Las Vegas → SF.
 ## Structure
 
 - [`itinerary.md`](itinerary.md) — full plan: timeline, day-by-day, bookings overview
+- [`expenses.md`](expenses.md) — shared-expense ledger and reconciliation notes
 - [`bookings/`](bookings/) — one file per accommodation / transport booking, with confirmation PDFs
 - [`emails/`](emails/) — host messages and receipts
 - Sights menus — candidate things to see per leg:

expenses.md

@@ -0,0 +1,38 @@
+# Expense Ledger
+
+Source: screenshot of the **LA Rookies** group in Tricount. The screenshot groups all entries under **“Today”** but does not show the calendar date or the split settings. The Tricount group's default currency is **USD**, so all ledger amounts below are recorded in USD.
+
+## Summary
+
+| Metric | Amount |
+|---|---:|
+| Total expenses | **US$2,460.51** |
+| My expenses | **US$615.13** |
+
+All three entries are shown as paid by **Maximus Decimus Meridius (me)**, recorded here as **MS**.
+
+## Recorded expenses
+
+| Date shown | Category | Expense | Amount | Paid by | Split shown |
+|---|---|---|---:|---|---|
+| Today | Accommodation | Sequoia cabin | US$771.75 | MS | Not visible |
+| Today | Accommodation | Yosemite cabin | US$933.75 | MS | Not visible |
+| Today | Accommodation | SF Airbnb | US$755.01 | MS | Not visible |
+| | | **Total** | **US$2,460.51** | | |
+
+## Likely four-way allocation — inferred, not shown
+
+The trip has four travelers, and one quarter of US$2,460.51 rounds to the displayed **US$615.13** “My Expenses” figure. This strongly suggests an equal four-way split, but the screenshot does not explicitly confirm it.
+
+| Expense | Inferred share per person |
+|---|---:|
+| Sequoia cabin | US$192.94 |
+| Yosemite cabin | US$233.44 |
+| SF Airbnb | US$188.75 |
+| **Rounded total per person** | **US$615.13** |
+
+## Reconciliation notes
+
+- **Yosemite:** US$933.75 matches [`bookings/cabin-yosemite-wawona.md`](bookings/cabin-yosemite-wawona.md).
+- **Sequoia:** the screenshot says **US$771.75**, while [`bookings/cabin-sequoia-miramonte.md`](bookings/cabin-sequoia-miramonte.md) says **US$771.16**. The **US$0.59 difference may be due to currency conversion or rounding** rather than an entry error.
+- **SF Airbnb:** the screenshot records **US$755.01**, while [`bookings/airbnb-sf-daly-city.md`](bookings/airbnb-sf-daly-city.md) records **CAD$1,049.54**. The Tricount amount is the USD ledger value and likely reflects currency conversion; preserve the original CAD booking amount as the source cost.