[Param-Harrison]

Summary

The CSV export's amount column now goes through formatCents, so it reads 45.00 instead of raw cents (4500). The CLI export command and the /export.csv route share exportCsv, so both get the fix.

Closes #161

Plan

Plan comment (rev 1) on issue #161, risk low:

• AC-1: the amount column is formatted for flat-4b (45.00, 12.00, 30.00). Verified by bun test tests/csv.test.ts (exportCsv formats the amount column as a decimal amount).
• AC-2: a non-round amount keeps its cents (1005 exports as 10.05). Verified by bun test tests/csv.test.ts (exportCsv keeps the cents of a non-round amount).
• AC-3: the CLI export prints formatted amounts. Verified by bun test tests/cli.test.ts (splitbill export prints formatted amounts).
• AC-4: header, row count and order are unchanged and the suite stays green. Verified by make check.

Non-goals, all respected: no changes to src/money/**, to the CSV columns, header, order or escaping, to routes, the CLI, the db or protected paths, and no schema change or float money math.

Gate evidence

FACTORY_GATES: status=GREEN passed=3 failed=0 skipped=1 failed_gates=audit

Verify verdict

Verdict comment on issue #161: pass, AC-1 to AC-4 all pass, no reviewer findings. The test that bites: with src/csv.ts reverted, exportCsv keeps the cents of a non-round amount fails (Expected: "10.05" Received: "1005"), and the other two new tests fail too. All three are assertion failures, not compile errors.

Not in this PR: csvEscape doesn't quote \r and doesn't guard against spreadsheet formula injection. Both exist on main already and should be their own issue.

Risk and rollback

Low: the only production change is in src/csv.ts, and it reuses the existing formatCents. Only the text of the amount values changes, and no schema or protected path is involved. To roll back, revert this PR's commit. No data migration is needed because amounts are still stored as integer cents.

Factory run

Stage	Agent	Duration	Tool calls	Cost	Outcome
triage	claude	15s	5	$0.07	ok
plan	claude	32s	6	$0.20	ok
build	claude	1m 45s	16	$0.34	ok
verify	claude	44s	11	$0.26	pass
pr	claude	18s	4	$0.08	ok

5 stage runs, 3m 35s, $0.95.

Went well

• triage, plan, build, verify, pr passed on the first attempt
• verify approved on the first round

Needed help

• nothing