Plain-Text Accounting Verifier

Parser scope – read before use Transactions start on an unindented YYYY-MM-DD line; postings are indented lines of the form Account  Amount (2+ spaces or a tab between them), optionally followed by  = assertion to check the running balance after that posting. Amounts are plain decimals with no currency symbol (100.00, not $100.00). At most one posting per transaction may omit its amount (auto-balanced from the others). A blank line closes a transaction. Any other line – account/commodity/include directives, comments, tags – is parsed as an unsupported directive: it is listed explicitly below and never silently dropped or guessed at.