Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Reconcile bank payments against open invoices (memo references, partial payments, exact-amount and 2-3 invoice combinations, ambiguity)

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  "result": "I wrote `recon.py` and ran it. It produced `recon.csv` and `open_invoices.csv` in this directory.\n\nOne thing to know: this machine has no `python` binary, only `python3`, so `python recon.py` fails with \"command not found\". I ran it as `python3 recon.py`. The script itself is stdlib-only and has no version-specific code. If your re-run environment uses `python`, it should work unchanged.\n\nResults: 55 payments, 42 open invoices. Status counts are 27 `matched_ref`, 6 `matched_amount`, 3 `matched_combo`, and 19 `unmatched`. There are no `ambiguous` rows in this data. Each `matched_ref` row also has a non-zero `unapplied` only where the payment exceeded the referenced balances (P024, P028, P036).\n\nChoices I made where the spec left room:\n- **Name matching:** the suffix-stripping loop removes trailing `ltd`, `llc`, `inc`, `gmbh`, `co` only, as written. \"Cobalt\" matches \"Cobalt GmbH\", and \"Birch Sons\" matches \"Birch & Sons LLC\".\n- **Memo regex:** `(?<![^\\W_])inv[ -]?([0-9]+)(?![0-9])` on the casefolded memo. The lookbehind excludes letters and digits but not underscore, which is what the spec says.\n- **Money parsing:** removes `$` and `,`, then strips surrounding whitespace. Outputs use `ROUND_HALF_UP` to 2 decimals. The inputs already have 2 decimals, so no rounding actually happens.\n- **Rule C counting:** 2-sets and 3-sets are counted together. More than one hit across both sizes gives `ambiguous`.\n- **Output:** `invoices` for `matched_ref` keeps memo order, and for `matched_combo` it is sorted ascending. Rows are sorted by `payment_id`. Open invoices are sorted by `invoice_id`.\n\nI spot-checked several rows by hand: P013 (2109.01 + 218.11 = 2327.12), P028 (2585.94 + 269.06 + 5.00 unapplied), P024 (INV-0038 already closed by P036, so only INV-0042 applies), and P004 (878.79 leaves 0.01 on INV-0026). I did not hand-verify the full run. The unmatched rows, such as P001, are the ones I'd look at first if the hidden checks disagree.\n\nThe directory is not a git repo, so I did not commit anything. Files are in `./usecase-runner/runs/i07-claude-haiku/work/`: `recon.py`, `recon.csv`, `open_invoices.csv`.",
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