v0.52.4 — super-ux

SKILL-CARD.md carries the fields Anthropic's Skills-for-enterprise guidance asks every
organisation to keep — "written so somebody who did not build this can decide". It said
0.48.3 while this package shipped 0.52.3.

Nothing read it, so it could only drift. The version moves in package.json,
plugin.json and marketplace.json on every release; the card was in no list. Measured
2026-09-01 across the family: four of nine cards were behind — this one by four minor
releases, agent-stack by ten.

The check refuses a card whose Version row disagrees with package.json, and refuses a
card that states no version at all: one a reader cannot see go stale is worse than one
that lags visibly. Watched failing before it shipped. repo validator checks
4617 → 4619, recomputed by the command the fact itself cites rather than by hand.

And the same defect as the sibling, in the same kind of place. test/validate.py
carried an invalid escape sequence — a lone backslash-pipe in a non-raw docstring — which
Python already warns about and future versions will reject. It sat in a paragraph
explaining that "the escape-awareness is the whole check". Now raw, zero escape
warnings — as agent-stack's was an hour earlier, from a paragraph explaining how to
escape a pipe.