Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Implement 5 Python functions from a task list

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 "result": "I created `solution.py` in the working directory with all five functions, and my quick tests pass. `tasks/TASKS.md` was there, but `solution.py` did not exist before, so I wrote it from scratch.\n\n- **`roman_to_int`**: scans left to right, subtracting a value when a smaller numeral precedes a larger one (IV, IX, XL, and so on).\n- **`merge_intervals`**: sorts by start and merges when the next start is less than or equal to the current end, so touching intervals merge. The input list is not mutated.\n- **`lru_cache_sim`**: uses an `OrderedDict`. Both `put` and a hit `get` move the key to most-recent, and inserts evict the least-recent key. A capacity of 0 stores nothing, so every `get` returns -1.\n- **`top_k_words`**: lowercases the text, takes `[a-z']+` runs, sorts by descending count then alphabetically, and returns the first k. A bare `'` counts as a word, since the spec defines words that way.\n- **`parse_duration`**: a single regex requires `h`, `m`, `s` components in that order, each at most once, with at least one present. Empty strings, `h`, `1x`, `1h1h`, `1m2h`, and `1 h` raise `ValueError`.\n\nThe tests covered the spec examples and the listed invalid inputs, plus a few edge cases such as capacity 0, touching intervals, and tie-breaking. I ran them with `python3 -I` and inserted the current directory onto `sys.path` by hand. I did not commit anything, since the directory is not a git repository.",
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