v0.1.319

## What's Changed


### CSV Export (Issue #30)
Export transactions to CSV for spreadsheets and data analysis:
```bash
tally up --format csv > transactions.csv
tally up --format csv --category Food > food.csv
```

CSV columns: date, description, amount, merchant, category, subcategory, source, tags, plus any extra fields from supplemental sources.

### Transform Directive
Override transaction descriptions dynamically in your rules:
```
[Apple Purchases - Enriched]
match: source("apple_purchases")
transform: " + ".join([r.title for r in m])
category: Entertainment
subcategory: Apple
```

Before: `APPLE.COM/BILL ONE APPLE PARK WAY CA`
After: `Endel: Focus & Sleep Sounds + Overcast`

Original description shown in UI with ✎ indicator on hover.

### Supplemental Sources Improvements
Supplemental data sources now only require `{date}` field - amount is optional:
```yaml
supplemental:
  - name: apple_purchases
    file: apple_purchases.csv
    format: "{date},{order_id},{title},{price}"
```

### Bug Fixes
- Fixed CSV header detection for semicolon-delimited files (#77)
- Improved error messages for let binding and field accessor failures


---

### Install

**Linux / macOS:**
```bash
curl -fsSL https://tallyai.money/install.sh | bash
```

**Windows PowerShell:**
```powershell
irm https://tallyai.money/install.ps1 | iex
```

Or download the zip for your platform below.

See https://tallyai.money for more info.