Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Unicode-correct username canonicalisation (NFKC, casefold, mixed-script), terminal width, cluster-safe truncation and slugs

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  "result": "I rewrote all four functions in `textnorm.py` to the spec. The spec examples pass in ad-hoc checks run against the file. I didn't add a test file to the work directory.\n\nWhat changed:\n\n- **`canonical_username`**: strips the listed format characters, applies NFKC and casefold, then strips whitespace. It checks length (3\u201332), allows only L*, Nd, `.`, `_`, `-`, and raises `ValueError` if letters come from more than one script (judged by the first word of `unicodedata.name`).\n- **`display_width`**: 0 for Mn, Me, Cf and Cc; 2 for East Asian Width W or F; 1 otherwise.\n- **`truncate`**: splits the string into clusters (base character plus marks, variation selectors and ZWJ-joined next character, and regional-indicator pairs), keeps whole clusters that fit, strips any trailing ZWJ, then appends the ellipsis. It returns `\"\"` if the ellipsis alone doesn't fit.\n- **`slugify`**: applies NFKD, drops marks, maps the listed letters (and uppercase forms), lowercases, collapses non-`a-z0-9` runs to `-`, and applies the 60-character word-boundary rule and the `\"n-a\"` fallback.\n\nChoices I made where the spec was silent or ambiguous:\n\n- **Digits-only usernames** such as `\"123\"` are allowed, since no letters means no script conflict.\n- **Slugify marks**: lowercasing can reintroduce a combining mark (`\"\u0130\"` becomes `i` plus U+0307), so I strip marks a second time after lowercasing. Without this, `\"\u0130\"` would become a `-` separator.\n- **Emoji ZWJ sequences** are treated as one unit, so `truncate` never cuts inside a family emoji.\n- **Mc (spacing combining marks)** attach to their base in `truncate`, though they count as width 1 like any other non-zero character.\n\nSpec-literal behaviours you may want to change:\n\n- Letters like `\u00f0` and dotless `\u0131` are not in the slug map, so they become `-`.\n- Modifier letters (category Lm) are judged by their name's first word, for example `MODIFIER`, so mixing one with Latin raises `ValueError`.\n\nThis directory is not a git repository, so I did not commit anything.",
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