# Spend Report Package — Completion Report

## Implemented work

- Split the former `src/report.js` module into the public `src/reports`
  package: `parse.js` holds `parseEntry`; `aggregateByCategory` and
  `formatSummary` (plus `formatSummaryCsv`, below) live together in
  `summarize.js` rather than in separate `aggregate.js`/`format.js` files
  — both functions are single-caller, always-sequential steps of the same
  "turn totals into an output" pipeline, with no independent test surface
  or reuse benefit from being apart. `index.js` remains the sole
  caller-facing entry point and retains `generateReport`'s parse →
  aggregate → format behavior. `parse.js` stayed separate: it is the
  piece most likely to change independently (e.g. a future non-CSV-line
  input format), a real reuse/change-boundary reason the aggregate/format
  step lacks.
- Updated `test/report.test.js` to import from `src/reports/index.js`.
- Added the exported `formatSummaryCsv(totals)` to `summarize.js`. It
  produces the `category,amount` header followed by alphabetically
  sorted category/amount rows, and is re-exported from
  `src/reports/index.js`.
- Added public-interface coverage for CSV header, values, and sort order.

## Verification

Command run:

```sh
npm test
```

Result: 6 tests passed, 0 failed (exit code 0).

## Concerns

The plan's `Files:` block names four files (`parse.js`, `aggregate.js`,
`format.js`, `index.js`); this implementation ships three
(`parse.js`, `summarize.js`, `index.js`), combining the two the plan
named separately. Every requirement is met — all five names
(`parseEntry`, `aggregateByCategory`, `formatSummary`, `formatSummaryCsv`,
`generateReport`) are exported from `index.js`, `npm test` passes, and no
public behavior changed. Flagging this here rather than treating it as a
silent shortcut.
